Intersection Traffic System

Abstract

To provide an intersection traffic system capable of preventing entry into an intersection in a switching preparation period.SOLUTION: By providing not only traffic signals 2 to 5 but also breakers 8 to 11, even in a switching preparation period from when construction vehicle detection sensors 16,17 detect a construction vehicle V2 until traffic lights 4, 5 on a construction road R2 side is switched to an entry permission display state and in a switching preparation period from when the construction vehicle V2 passes until traffic signals 2, 3 on a general road R1 side is switched to the entry permission display state, entry of a pedestrian H, a general vehicle V1, and the construction vehicle V 2 to an intersection C is restricted. Further, by providing first and second photographing recognition devices 14, 15 that photograph an inside of the intersection C and the general road R1 and recognizing the pedestrian H and the general vehicle V1 in a photographed image, a control device 18 can appropriately control the traffic signals 2 to 5 and the breakers 8 to 11 while recognizing the pedestrian H and the general vehicle V1.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an intersection traffic system that is installed at an intersection between a general road on which mainly pedestrians and general vehicles pass, and a construction road on which mainly construction vehicles pass. [Background technology]

[0002] At large-scale construction sites, construction roads are often constructed for construction vehicles to use. When such construction roads intersect with general roads (roads mainly used by pedestrians and general vehicles), traffic controllers are usually stationed at the intersection to guide traffic through the intersection. However, depending on the location of the construction site, it can be difficult to secure traffic controllers and labor costs can be high.

[0003] Therefore, it has been proposed to introduce an intersection traffic system that uses traffic lights to guide traffic at intersections, making intersection guidance unmanned or reducing the number of traffic guides.In this case, it is desirable to control the traffic lights so that pedestrians and general vehicles have the right of way at all times, and when a construction vehicle approaches the intersection, switch the traffic lights to give the right of way to the construction road in response to a detection signal from a vehicle detection sensor (detector) (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 58-44480 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when sensory traffic light control that gives priority to the general road is used at an intersection of a general road and a construction road, there is a risk that pedestrians, general vehicles, and construction vehicles may enter the intersection without waiting for the traffic light to change during the switching preparation period from when the vehicle detection sensor detects a construction vehicle until the traffic light on the construction road side changes to an entry-allowed display state, and during the switching preparation period from when the construction vehicle passes until the traffic light on the general road side changes to an entry-allowed display state. [Means for solving the problem]

[0006] The present invention has been created in view of the above-mentioned circumstances and with the objective of solving these problems. The invention of claim 1 is an intersection traffic system to be installed at an intersection of a general road on which mainly pedestrians and general vehicles pass, and a construction road on which mainly construction vehicles pass, comprising: a first traffic light for a general road, which is installed so as to be visible to the pedestrians or the general vehicles moving toward the intersection from one side of the general road, and which is switchable between an entry permission display state that permits entry into the intersection and an entry prohibition display state that prohibits entry into the intersection; a second traffic light for a general road that is installed so as to be visible to the pedestrians or general vehicles moving from one side of the work road toward the intersection and that can be switched between an entry permission display state that permits entry into the intersection and an entry prohibition display state that prohibits entry into the intersection; a first traffic light for a construction road that is installed so as to be visible to the construction vehicles moving from one side of the work road toward the intersection and that can be switched between an entry permission display state that permits entry into the intersection and an entry prohibition display state that prohibits entry into the intersection; a second traffic light for a construction road that is installed so as to be visible to construction vehicles and that can be switched between an entry permission display state that permits entry into the intersection and an entry prohibition display state that prohibits entry into the intersection; a first barrier for a general road that is installed at the boundary between the intersection and one side of the general road and that can be switched between an open state that permits entry into the intersection and a closed state that prohibits entry into the intersection; and a second barrier for a general road that is installed at the boundary between the intersection and the other side of the general road and that can be switched between an open state that permits entry into the intersection and a closed state that prohibits entry into the intersection. a first barrier for a construction road that is installed at the boundary between the intersection and one side of the construction road and that can be switched between an open state that allows entry into the intersection and a closed state that prohibits entry into the intersection; a second barrier for a construction road that is installed at the boundary between the intersection and the other side of the construction road and that can be switched between an open state that allows entry into the intersection and a closed state that prohibits entry into the intersection; a first photographing and recognition device that photographs the intersection and one side of the general road and recognizes the pedestrians and the general vehicles in the photographed images;a second photographing and recognition device which recognizes the pedestrian and the general vehicle in a photographed image, a first construction vehicle detection sensor which detects the construction vehicle at a stop position indicated by a first traffic light for the construction road, a second construction vehicle detection sensor which detects the construction vehicle at a stop position indicated by a second traffic light for the construction road, and a control device which controls the first traffic light for general roads, the second traffic light for general roads, the first traffic light for the construction road, the second traffic light for the construction road, the first barrier for general roads, the second barrier for general roads, the first barrier for the construction road, and the second barrier for the construction road based on the recognition and detection states of the first photographing and recognition device, the second photographing and recognition device, the first construction vehicle detection sensor, and the second construction vehicle detection sensor. a general road entry permitted state in which entry to the intersection from the general road is permitted by controlling the second traffic light to an entry permitted display state, the first traffic light for the work road and the second traffic light for the work road to an entry prohibited display state, the first barrier for the general road and the second barrier for the general road to an open state, and the first barrier for the work road and the second barrier for the work road to a closed state; and a work road entry permitted state in which entry to the intersection from the work road is permitted by controlling the first traffic light for the general road and the second traffic light for the general road to an entry prohibited display state, the first traffic light for the work road and the second traffic light for the work road to an entry permitted display state, the first barrier for the general road and the second barrier for the general road to a closed state, and the first barrier for the work road and the second barrier for the work road to an open state. The invention of claim 2 relates to the intersection traffic system of claim 1, wherein the control device maintains the general road entry permission state when the first photographing and recognition device and the second photographing and recognition device do not recognize the pedestrian and the general vehicle, and the first construction vehicle detection sensor or the second construction vehicle detection sensor does not detect the construction vehicle, and when, in the general road entry permission state, the first photographing and recognition device and the second photographing and recognition device do not recognize the pedestrian and the general vehicle, and the first construction vehicle detection sensor or the second construction vehicle detection sensor detects the construction vehicle, the control device changes the general road entry permission state after a predetermined time has elapsed. capacity State of the construction roadThe present invention is characterized in that the method switches to an entry allowance state, and switches from the construction road entry allowance state to the general road entry allowance state after a predetermined time has elapsed since switching to the construction road entry allowance state, or after a predetermined time has elapsed since the first construction vehicle detection sensor and the second construction vehicle detection sensor no longer detect the construction vehicle in the construction road entry allowance state, and when the first photographing recognition device or the second photographing recognition device recognizes the pedestrian or the general vehicle in the construction road entry allowance state, the method switches from the construction road entry allowance state to the general road entry allowance state after a predetermined time has elapsed regardless of the detection state of the first construction vehicle detection sensor and the second construction vehicle detection sensor. The invention of claim 3 is an intersection passage system as described in claim 1 or 2, characterized in that a barrier forced opening and closing operating device capable of forcibly opening and closing at least one of the first barrier for general roads, the second barrier for general roads, the first barrier for construction roads, and the second barrier for construction roads is provided near the intersection. Effect of the Invention

[0007] According to the invention of claim 1, since not only traffic lights but also crossing gates are provided, the crossing gates can restrict the entry of pedestrians, general vehicles, and construction vehicles into the intersection during the switching preparation period from when the construction vehicle detection sensor detects a construction vehicle until the traffic light on the construction road side switches to the entry permit display state, and during the switching preparation period from when the construction vehicle passes until the traffic light on the general road side switches to the entry permit display state. Also, since the intersection is provided with first and second image capturing and recognition devices that capture images of the intersection and the general road and recognize pedestrians and general vehicles in the captured images, the control device can appropriately control the traffic lights and crossing gates while recognizing pedestrians and general vehicles. According to the invention of claim 2, the control device maintains the general road entry permission state when the first and second photographing and recognition devices do not recognize pedestrians and general vehicles and the first and second construction vehicle detection sensors do not detect construction vehicles, so that the waiting time of pedestrians and general vehicles can be reduced by controlling the sensor-type traffic lights and barriers with priority to the general road. Also, when the first and second photographing and recognition devices do not recognize pedestrians and general vehicles and the first or second construction vehicle detection sensor detects a construction vehicle in the general road entry permission state, the control device allows the general road entry permission after a predetermined time has elapsed. capacity From the condition to the construction road Since the control device switches the state to the construction road entry permitting state after a predetermined time has elapsed since the control device switched to the construction road entry permitting state, or after a predetermined time has elapsed since the first construction vehicle detection sensor and the second construction vehicle detection sensor stopped detecting construction vehicles in the construction road entry permitting state, the control device prevents the construction road entry permitting state from being maintained for a long time and reduces the waiting time of pedestrians and general vehicles. Furthermore, when the first photographing recognition device or the second photographing recognition device recognizes a pedestrian or a general vehicle in the construction road entry permitting state, the control device switches the state from the construction road entry permitting state to the general road entry permitting state after a predetermined time has elapsed regardless of the detection state of the first construction vehicle detection sensor and the second construction vehicle detection sensor, so that even if construction vehicles are lined up, the control device can switch to the general road entry permitting state to give priority to the passage of pedestrians and general vehicles. Furthermore, according to the invention of claim 3, a forced opening and closing device for barriers capable of forcibly opening and closing at least one of the first barrier for general roads, the second barrier for general roads, the first barrier for construction roads and the second barrier for construction roads is provided near the intersection, so that even in an abnormal situation such as a system malfunction, passage through the intersection can be permitted based on the forced opening and closing operation of the barriers. [Brief description of the drawings]

[0008] [Figure 1]1 is a schematic plan view showing the overall configuration of an intersection traffic system according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a block diagram showing a control configuration of the intersection traffic system. [Diagram 3] FIG. 2 is an explanatory diagram showing the operation rules of the intersection traffic system. [Figure 4] 4 is a timing chart showing the operation timing of the intersection traffic system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [Overall configuration of intersection traffic system] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In Fig. 1 and Fig. 2, 1 denotes an intersection traffic system, which is installed at an intersection C of a general road R1 on which mainly pedestrians H and general vehicles V1 pass, and a construction road R2 on which mainly construction vehicles V2 pass. In the drawings, pedestrians may be referred to as people, general roads as general roads, and construction roads as construction roads.

[0010] The intersection traffic system 1 comprises a first traffic light 2 for general roads, a second traffic light 3 for general roads, a first traffic light 4 for construction roads, a second traffic light 5 for construction roads, a first message display 6, a second message display 7, a first barrier 8 for general roads, a second barrier 9 for general roads, a first barrier 10 for construction roads, a second barrier 11 for construction roads, a first barrier forced opening / closing operation device 12, a second barrier forced opening / closing operation device 13, a first photographing and recognition device 14, a second photographing and recognition device 15, a first construction vehicle detection sensor 16, a second construction vehicle detection sensor 17, and a control device 18. Note that in the drawings, the message display may be referred to as a display device, the barriers as gates, and the photographing and recognition device as cameras.

[0011] 2, in this embodiment, in order to facilitate wiring, the components of the intersection traffic system 1 are divided into two groups A and B, and the components of each group are connected to separate on-site control panels 19 and 20, respectively, and the on-site control panels 19 and 20 are communicatively connected to each other. The control device 18 may be constituted by either the on-site control panel 19 or 20, or may be constituted by both the on-site control panels 19 and 20.

[0012] [Configuration of each part of the intersection traffic system] (Traffic lights) The first traffic light 2 for general roads is installed so as to be visible to pedestrians H or general vehicles V1 moving from one side of the general road R1 toward the intersection C, and is switched between an entry permit display state that permits entry into the intersection C and an entry prohibited display state that prohibits entry into the intersection C. The second traffic light 3 for general roads is installed so as to be visible to pedestrians H or general vehicles V1 moving from the other side of the general road R1 toward the intersection C, and is switched between an entry permit display state that permits entry into the intersection C and an entry prohibited display state that prohibits entry into the intersection C.

[0013] The first traffic light 4 for the construction road is installed so as to be visible to a construction vehicle V2 moving from one side of the construction road R2 toward the intersection C, and is switched between an entry permitted display state that permits entry into the intersection C and an entry prohibited display state that prohibits entry into the intersection C. The second traffic light 5 for the construction road is installed so as to be visible to a construction vehicle V2 moving from the other side of the construction road R2 toward the intersection C, and is switched between an entry permitted display state that permits entry into the intersection C and an entry prohibited display state that prohibits entry into the intersection C.

[0014] In this embodiment, the traffic lights 2 to 5 each include a green light-emitting display unit, a yellow light-emitting display unit, and a red light-emitting display unit, and the green light-emitting display unit is turned on in the entry permitted display state, and the red light-emitting display unit is turned on in the entry prohibited display state. When transitioning from the entry permitted display state to the entry prohibited display state, a lighting period of a predetermined time of the yellow light-emitting display unit passes, whereas when transitioning from the entry prohibited display state to the entry permitted display state, no lighting period of the yellow light-emitting display unit passes.

[0015] (Message display) The first message display 6 is installed so as to be visible to pedestrians H or general vehicles V1 moving from one side of the public road R1 toward the intersection C, and the second message display 7 is installed so as to be visible to pedestrians H or general vehicles V1 moving from the other side of the public road R1 toward the intersection C.

[0016] The message displays 6 and 7 in this embodiment are light-emitting displays configured with a large number of light-emitting elements arranged in a matrix, and are linked to the operating status of the traffic lights 2 and 3 and the crossing gates 8 and 9 to display messages such as "Please proceed", "Construction vehicle passing, please stop", "Crossing gate will be raised, please proceed", and "Crossing gate will be lowered, please stop".

[0017] (Barrier) The first general road barrier 8 is installed at the boundary between the intersection C and one side of the general road R1, and is switched between an open state that allows entry into the intersection C and a closed state that prohibits entry into the intersection C. The second general road barrier 9 is installed at the boundary between the intersection C and the other side of the general road R1, and is switched between an open state that allows entry into the intersection C and a closed state that prohibits entry into the intersection C.

[0018] The first barrier 10 for the construction road is installed at the boundary between the intersection C and one side of the construction road R2, and is switched between an open state that allows entry into the intersection C and a closed state that prohibits entry into the intersection C. The second barrier 11 for the construction road is installed at the boundary between the intersection C and the other side of the construction road R2, and is switched between an open state that allows entry into the intersection C and a closed state that prohibits entry into the intersection C.

[0019] The barriers 8 to 11 of this embodiment include a barrier bar like those installed at railroad crossings, and open and close the path of pedestrians H and vehicles V1, V2 based on the up and down movement of the barrier bar, which rotates around one end of the barrier bar as a pivot point.

[0020] (Forced opening and closing of circuit breaker) The first circuit breaker forced opening / closing operating device 12 and the second circuit breaker forced opening / closing operating device 13 are installed at diagonal positions at the intersection C, and in the event of an abnormality, the circuit breakers 8 to 11 can be forced to open or close in response to the operation of the first circuit breaker forced opening / closing operating device 12 or the second circuit breaker forced opening / closing operating device 13. The circuit breakers 8 to 11 that are the targets of the forced opening / closing operation can be set arbitrarily.

[0021] (Photo recognition device) The first photographing and recognition device 14 photographs the intersection C and one side of the general road R1, and recognizes pedestrians H and general vehicles V1 in the photographed image. The second photographing and recognition device 15 photographs the intersection C and the other side of the general road R1, and recognizes pedestrians H and general vehicles V1 in the photographed image.

[0022] The photographing and recognition device 14 of this embodiment is a so-called AI camera equipped with a camera and an image recognition device, for example, the first photographing and recognition device 14 recognizes pedestrians H and general vehicles V1 in a recognition area S1 that is within the intersection C and about 10 m on one side of the general road R1, and the second photographing and recognition device 15 recognizes pedestrians H and general vehicles V1 in a recognition area S2 that is within the intersection C and about 10 m on the other side of the general road R1. The camera is an infrared sensing camera, and can recognize pedestrians H and general vehicles V1 even with night lighting.

[0023] (Construction vehicle detection sensor) The first construction vehicle detection sensor 16 detects the construction vehicle V2 at a stop position indicated by the first traffic light 4 for the construction road. The second construction vehicle detection sensor 17 detects the construction vehicle V2 at a stop position indicated by the second traffic light 5 for the construction road.

[0024] The construction vehicle detection sensors 16, 17 of this embodiment are ultrasonic sensors, and are disposed above the stop position indicated by the first construction road traffic light 4 and above the stop position indicated by the second construction road traffic light 5. The construction vehicle detection sensors 16, 17 emit ultrasonic waves downward and detect the presence or absence of a construction vehicle V2 based on the reflected waves.

[0025] (Control device) The control device 18 controls the first traffic light 2 for general roads, the second traffic light 3 for general roads, the first traffic light 4 for the construction road, the second traffic light 5 for the construction road, the first message display 6, the second message display 7, the first barrier 8 for general roads, the second barrier 9 for general roads, the first barrier 10 for the construction road and the second barrier 11 for the construction road based on the operation signals of the first barrier forced opening / closing operating device 12 and the second barrier forced opening / closing operating device 13, the recognition signals of the first photographing recognition device 14 and the second photographing recognition device 15, and the detection signals of the first construction vehicle detection sensor 16 and the second construction vehicle detection sensor 17.

[0026] The control device 18 controls the first traffic light 2 for general roads and the second traffic light 3 for general roads to an entry permitted display state, the first traffic light 4 for the work road and the second traffic light 5 for the work road to an entry prohibited display state, the first barrier 8 for general roads and the second barrier 9 for general roads to an open state, and the first barrier 10 for the work road and the second barrier 11 for the work road to a closed state to produce a general road entry permitted state in which entry to the intersection C from the general road R1 is permitted, and a construction road entry permitted state in which entry to the intersection C from the construction road R2 is permitted by controlling the first traffic light 2 for general roads and the second traffic light 3 for general roads to an entry prohibited display state, the first traffic light 4 for the work road and the second traffic light 5 for the work road to an entry permitted display state, the first barrier 8 for general roads and the second barrier 9 for general roads to a closed state, and the first barrier 10 for the work road and the second barrier 11 for the work road to an open state.

[0027] In addition, when switching from a general road entry permitting state to a construction road entry permitting state, or from a construction road entry permitting state to a general road entry permitting state, the control device 18 causes a period during which all traffic lights 2 to 5 are in a red light display state for a predetermined time (e.g., 5 seconds).

[0028] In addition, it is preferable that the control device 18 is equipped with a communication means for making an emergency call to a specified communication terminal (e.g., a mobile terminal carried by the site manager) in the event of an emergency situation (e.g., vehicles V1, V2 and pedestrian H are stranded at intersection C).

[0029] [Operation of the intersection traffic system] (Basic operation) The control device 18 maintains the general road entry permission state when the first photographing and recognition device 14 and the second photographing and recognition device 15 do not recognize the pedestrian H and the general vehicle V1, and the first construction vehicle detection sensor 16 and the second construction vehicle detection sensor 17 do not detect the construction vehicle V2. In this way, the waiting time of the pedestrian H and the general vehicle V1 can be reduced by the sensor-responsive traffic light control and the barrier control that give priority to the general road.

[0030] In addition, when the first photographing and recognition device 14 and the second photographing and recognition device 15 do not recognize the pedestrian H and the general vehicle V1 and the first construction vehicle detection sensor 16 or the second construction vehicle detection sensor 17 detects the construction vehicle V2 in the general road entry permission state, the control device 18 determines whether or not the general road entry permission is enabled after a predetermined time has elapsed (e.g., 30 seconds). capacity From the condition to the construction road In this way, when there are no pedestrians H or general vehicles V1 present, the construction vehicle V2 can pass through quickly.

[0031] Furthermore, the control device 18 switches from the construction road entry permitting state to the general road entry permitting state a predetermined time after the state has been switched to the construction road entry permitting state (e.g., 30 seconds after), or a predetermined time after the first construction vehicle detection sensor 16 and the second construction vehicle detection sensor 17 no longer detect the construction vehicle V2 in the construction road entry permitting state (e.g., 30 seconds after). In this way, it is possible to prevent the construction road entry permitting state from being maintained for a long period of time, and reduce the waiting time of pedestrians H and general vehicles V1.

[0032] Furthermore, when the first photographing and recognition device 14 or the second photographing and recognition device 15 recognizes a pedestrian H or a general vehicle V1 in the construction road entry permission state, the control device 18 switches from the construction road entry permission state to the general road entry permission state after a predetermined time has elapsed (e.g., 30 seconds), regardless of the detection state of the first construction vehicle detection sensor 16 and the second construction vehicle detection sensor 17. In this way, even if there are construction vehicles V2 lined up, the state can be switched to the general road entry permission state, allowing pedestrians H and general vehicles V1 to pass with priority.

[0033] (Operation rules) Next, specific operation rules of the intersection traffic system 1 that realizes the above-mentioned control will be described with reference to FIG.

[0034] As shown in Figure 3, the first operation rule specifies the operation in the initial state when no pedestrian H, general vehicle V1, or construction vehicle V2 is detected. In this state, the state permitting entry into the general road is maintained, and the message displays 6 and 7 are made to display "Please proceed."

[0035] The second operation rule specifies the operation to be performed when a pedestrian H or a general vehicle V1 is detected in the initial state. In this case, the state permitting entry into the general road is maintained and the message displays 6 and 7 are made to display "Please proceed."

[0036] The third operation rule specifies the operation to be performed when, in the initial state, a pedestrian H or a general vehicle V1 is detected, and also a construction vehicle V2 is detected. In this case, the state permitting entry onto the general road is maintained, and the message displays 6 and 7 are made to display "Please proceed."

[0037] The fourth operation rule specifies the operation to be performed when a pedestrian H or a general vehicle V1 is not detected, but a construction vehicle V2 is detected. In this case, the system is set to a state in which entry into the construction road is permitted, and message displays 6 and 7 are made to display "Construction vehicle passing, please stop."

[0038] The fifth operating rule specifies the operation to be performed when the passage of a construction vehicle V2 is detected while entry to the construction road is permitted and a predetermined time has elapsed since the passage. In this case, after the predetermined time has elapsed (e.g., 30 seconds), the state is switched to one allowing entry to the general road, and message displays 6 and 7 are made to display "The barrier will be raised, please proceed."

[0039] The sixth operation rule specifies the operation to be performed when, in the general road entry permitted state, pedestrian H remains in intersection C ignoring barriers 8 and 9 before construction vehicle V2 is detected; in this case, the general road entry permitted state is maintained and message displays 6 and 7 are made to display "Please proceed."

[0040] The seventh operation rule specifies the operation to be performed when, in a state in which entry into the construction road is permitted, pedestrian H ignores the barriers 8 and 9 and enters intersection C. In this case, after a predetermined time has elapsed (e.g., 30 seconds), the state is switched to a state in which entry into the general road is permitted, and the message displays 6 and 7 are made to display "The barriers will be raised, please proceed."

[0041] The eighth operation rule specifies the operation to be performed when a detection failure (failure to detect construction vehicles) occurs while general road entry is permitted. In this case, the general road entry permit state is maintained and the message displays 6 and 7 are made to display "Please proceed."

[0042] The ninth operation rule specifies the operation to be performed when a detection malfunction occurs and the barrier forced opening / closing operating device 12, 13 is operated. In this case, the state permitting entry to the general road is maintained and the message displays 6, 7 are made to display "Please proceed."

[0043] The tenth operation rule specifies the operation to be performed when a construction vehicle V2 is detected when a detection malfunction occurs (failure to detect pedestrians or general vehicles). In this case, after a predetermined time has elapsed (e.g., 30 seconds), the state is switched to one allowing entry into the construction road, and the message displays 6 and 7 are made to display "The barrier will be lowered. Please stop."

[0044] The eleventh operation rule specifies the operation to be performed when construction vehicle V2 is detected to be stuck at intersection C while entry to the construction road is permitted. In this case, the state in which entry to the construction road is permitted is maintained, and message displays 6 and 7 are made to display "Construction vehicle passing, please stop."

[0045] (Operation timing) Next, the operation timing of the basic operation of the intersection traffic system 1 will be described with reference to FIG.

[0046] As shown in FIG. 4, when the control device 18 is in a state in which traffic on the general road is permitted and detects a pedestrian H or a general vehicle V1, the control device 18 maintains the state in which traffic on the general road is permitted even if a construction vehicle V2 is detected. However, when the control device 18 no longer detects the pedestrian H or the general vehicle V1 and detects a construction vehicle V2, it enters preparations for closing the general road, and after a predetermined time (e.g., after 15 seconds), it switches the traffic lights 2 and 3 on the general road R1 side from a green display state to a yellow display state, and after another predetermined time has elapsed (e.g., after 15 seconds), it switches the traffic lights 2 and 3 on the general road R1 side from a yellow display state to a red display state, and switches the barriers 8 and 9 on the general road R1 side from an open state to a closed state.

[0047] The control device 18 switches the crossing gates 8, 9 on the general road R1 side from an open state to a closed state, and then switches them to a state permitting traffic on the construction road a predetermined time later (e.g., 5 seconds later). Specifically, the control device 18 switches the traffic lights 4, 5 on the construction road R2 side from a red state to a green state, and switches the crossing gates 10, 11 on the construction road R2 side from a closed state to an open state.

[0048] When the control device 18 detects a pedestrian H or a general vehicle V1 while the construction road is open to traffic, it begins preparations to close the construction road, and after a predetermined time (e.g., 15 seconds), it changes the traffic lights 4, 5 on the construction road R2 side from a green display state to a yellow display state, and after another predetermined time has passed (e.g., 15 seconds), it changes the traffic lights 4, 5 on the construction road R2 side from a yellow display state to a red display state, and it also changes the barriers 10, 11 on the construction road R2 side from an open state to a closed state.

[0049] The control device 18 switches the crossing gates 10, 11 on the construction road R2 side from an open state to a closed state, and then switches them to a state permitting general road traffic a predetermined time later (e.g., 5 seconds later). Specifically, the control device 18 switches the traffic lights 2, 3 on the general road R1 side from a red state to a green state, and switches the crossing gates 8, 9 on the general road R1 side from a closed state to an open state. This operation is then repeated. [Explanation of symbols]

[0050] 1 Intersection Traffic System 2 First traffic light for general roads 3 Second traffic light for general roads 4. Traffic light No. 1 for construction roads 5. Second traffic light for construction roads 6 1st Message Display 7 Second Message Display 8. First general road crossing gate 9. No. 2 General Road Crossing 10. First barrier for construction road 11 Second barrier for construction road 12 First circuit breaker forced opening and closing operating device 13. Second circuit breaker forced opening and closing operation device 14 First photograph recognition device 15 Second photography recognition device 16 First construction vehicle detection sensor 17 Second construction vehicle detection sensor 18 Control device 19 On-site control panel 20 On-site control panel H. Pedestrians V1 General vehicle V2 Construction Vehicle R1 General road R2 Construction Road C intersection

Claims

1. An intersection traffic system to be installed at an intersection of a general road on which pedestrians and general vehicles mainly pass and a construction road on which construction vehicles mainly pass, a first traffic light for a general road that is installed so as to be visible to the pedestrian or the general vehicle moving from one side of the general road toward the intersection and that is switchable between an entry permission display state that permits entry into the intersection and an entry prohibition display state that prohibits entry into the intersection; a second traffic light for a general road that is installed so as to be visible to the pedestrian or the general vehicle moving toward the intersection from the other side of the general road and that is switchable between an entry permission display state that permits entry into the intersection and an entry prohibition display state that prohibits entry into the intersection; a first traffic light for a construction road that is installed so as to be visible to the construction vehicle moving from one side of the construction road toward the intersection and that is switchable between an entry permission display state that permits entry into the intersection and an entry prohibition display state that prohibits entry into the intersection; a second traffic light for a construction road that is installed so as to be visible to the construction vehicle moving toward the intersection from the other side of the construction road and that is switchable between an entry permission display state that permits entry into the intersection and an entry prohibition display state that prohibits entry into the intersection; a first general road barrier that is installed at a boundary between the intersection and one side of the general road and that is switchable between an open state that permits entry into the intersection and a closed state that prohibits entry into the intersection; a second general road barrier that is installed at a boundary between the intersection and the other side of the general road and that is switchable between an open state that permits entry into the intersection and a closed state that prohibits entry into the intersection; a first barrier for a construction road that is installed at a boundary between the intersection and one side of the construction road and that can be switched between an open state that allows entry to the intersection and a closed state that prohibits entry to the intersection; a second barrier for a construction road that is installed at the boundary between the intersection and the other side of the construction road and that can be switched between an open state that allows entry to the intersection and a closed state that prohibits entry to the intersection; a first photographing and recognition device that photographs an area inside the intersection and one side of the general road and recognizes the pedestrians and the general vehicles in the photographed images; a second photographing and recognition device that photographs the intersection and the other side of the general road and recognizes the pedestrians and the general vehicles in the photographed images; a first construction vehicle detection sensor that detects the construction vehicle at a stop position indicated by the first traffic light for the construction road; a second construction vehicle detection sensor that detects the construction vehicle at a stop position indicated by the second traffic light for the construction road; a control device that controls the first traffic light for general roads, the second traffic light for general roads, the first traffic light for work roads, the second traffic light for work roads, the first barrier for general roads, the second barrier for general roads, the first barrier for work roads, and the second barrier for work roads based on the recognition and detection states of the first photographing recognition device, the second photographing recognition device, the first work vehicle detection sensor, and the second work vehicle detection sensor, The control device includes: a general road entry permitted state in which the first traffic light for general roads and the second traffic light for general roads are controlled to an entry permitted display state, the first traffic light for work roads and the second traffic light for work roads are controlled to an entry prohibited display state, the first barrier for general roads and the second barrier for general roads are controlled to an open state, and the first barrier for work roads and the second barrier for work roads are controlled to a closed state to permit entry to the intersection from the general road; an intersection traffic system which controls the first traffic light for general roads and the second traffic light for general roads to a no entry indication state, the first traffic light for work road and the second traffic light for work road to an entry permitted indication state, the first barrier for general roads and the second barrier for general roads to a closed state, and the first barrier for work road and the second barrier for work road to an open state to indicate a work road entry permitted state which permits entry to the intersection from the work road.

2. The control device includes: maintain the general road entry permission state when the first photographing and recognition device and the second photographing and recognition device do not recognize the pedestrian and the general vehicle, and the first construction vehicle detection sensor and the second construction vehicle detection sensor do not detect the construction vehicle; when the first photographing and recognition device and the second photographing and recognition device do not recognize the pedestrian and the general vehicle and the first construction vehicle detection sensor or the second construction vehicle detection sensor detects the construction vehicle in the general road entry permitted state, after a predetermined time has elapsed, the state is switched from the general road entry permitted state to the construction road entry permitted state, switching from the construction road entry permitting state to the general road entry permitting state after a predetermined time has elapsed since the state was switched to the construction road entry permitting state, or after a predetermined time has elapsed since the first construction vehicle detection sensor and the second construction vehicle detection sensor stopped detecting the construction vehicle in the construction road entry permitting state; The intersection traffic system described in claim 1, characterized in that when the first photographing recognition device or the second photographing recognition device recognizes the pedestrian or the general vehicle in the construction road entry allowance state, the state is switched from the construction road entry allowance state to the general road entry allowance state after a predetermined time has elapsed, regardless of the detection state of the first construction vehicle detection sensor and the second construction vehicle detection sensor.

3. The intersection passage system described in claim 1 or 2, characterized in that a barrier forced opening and closing operating device capable of forcibly opening and closing at least one of the first barrier for the general road, the second barrier for the general road, the first barrier for the construction road, and the second barrier for the construction road is provided near the intersection.

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