Method for releasing traffic at intersections connecting tunnel entrances and exits

Abstract

The present invention discloses a release method for an intersection connecting a tunnel entrance and exit. When the tunnel entrances and exits are connected on the east and west sides of the intersection, the east-to-west main road straight traffic flow and the east-to-west tunnel straight traffic flow are set at different signal light phases, and the south-to-north main road left-turn traffic flow and the north-to-south main road right-turn traffic flow are set at different signal light phases, which can effectively improve the congestion phenomenon at the intersection connecting the tunnel entrance and exit.

Description

Technical Field

[0001] The present invention relates to the technical field of traffic signal control, in particular to the technical field of signal control at an intersection connecting a tunnel entrance and exit. Background Art

[0002] At present, driving difficulties are still one of the main problems of road traffic in major cities, especially in old urban areas with relatively poor road capacity; with the acceleration of urbanization and the continuous improvement of living standards, the number of motor vehicles has been increasing year by year, and the problem of urban traffic congestion has become increasingly serious.

[0003] In order to alleviate the congestion of urban roads, traffic management agencies usually choose to use traffic lights (such as the multi-phase multifunctional composite LED traffic lights with announcement number CN206610445U) to regulate traffic order; the bottleneck of urban road traffic is mainly concentrated at intersections (intersections are the throat of urban road traffic and one of the main factors causing traffic delays, often restricting the service level of the entire road and even the road network), and traffic lights can also use the phase of the signal lights to give corresponding release times for traffic flows in different directions, thereby ensuring traffic smoothness and traffic travel safety, such as the lane-light group-phase association mapping method of the signal-controlled intersection with announcement number CN108470454B and the four-way roundabout design method based on single-port release with announcement number CN103116992B.

[0004] See also Figures 1 to 4 Compared with ordinary cross-shaped intersections, intersections connecting tunnel entrances and exits are often more complex in structure (taking the intersections connecting tunnel entrances and exits on the east and west sides as an example: the north side of the intersection has north exit main road 1 and north entrance main road 2, the east side of the intersection has east tunnel exit road 3, east exit main road 4 and east entrance main road 5, the south side of the intersection has south exit main road 6 and south entrance main road 7, the west side of the intersection has west exit main road 8, west tunnel exit road 9, west entrance main road 10, west tunnel entrance road 11 and auxiliary road 12); in order to avoid traffic jams, the existing traffic management Agencies usually divide the vehicle flows at the intersections connecting the tunnel entrances and exits into 12 different directions (i.e., north straight traffic, north right-turn traffic, north left-turn traffic, east straight traffic, east right-turn traffic, east left-turn traffic, south straight traffic, south right-turn traffic, south left-turn traffic, west straight traffic, west right-turn traffic, and west left-turn traffic), and use four signal light phases to allocate road traffic resources (traffic lights use different signal light setting schemes during morning peak hours and non-morning peak hours); however, this release method has the following problems:

[0005] 1) See Figure 1 and Figure 2During the morning rush hour, straight-moving vehicles on the east side of the intersection can drive westward from the east tunnel exit road 3 or the east exit main road 4 to the west entrance main road 10, the west tunnel entrance road 11 or the auxiliary road 12, while vehicles driving from the east exit main road 4 to the west tunnel entrance road 11 or the auxiliary road 12 and vehicles driving from the east tunnel exit road 3 to the west entrance main road 10 may conflict with each other and cause traffic jams (such as Figure 1 as indicated by the arrow in );

[0006] 2) See Figure 3 and Figure 4 During non-peak hours, right-turning vehicles on the north side of the intersection can turn right from the north exit main road 1 to the west entrance main road 10, the west tunnel entrance road 11 or the auxiliary road 12. Left-turning vehicles on the south side of the intersection can turn left from the south exit main road 6 to the west entrance main road 10, the west tunnel entrance road 11 or the auxiliary road 12. However, vehicles heading from the north exit main road 1 to the west entrance main road 10 and vehicles heading from the south exit main road 6 to the west tunnel entrance road 11 or the auxiliary road 12 may conflict with each other and cause traffic jams (such as Figure 3 The arrows in Figure 4 ). Summary of the invention

[0007] The purpose of the present invention is to solve the problems in the prior art and to propose a method for releasing traffic at an intersection connecting a tunnel entrance and exit, which can effectively improve the congestion at the intersection connecting a tunnel entrance and exit.

[0008] To achieve the above-mentioned purpose, the present invention proposes a release method for an intersection connecting a tunnel entrance and exit. When the tunnel entrances and exits are connected on the east and west sides of the intersection, the east-west main road straight traffic flow and the east-west tunnel straight traffic flow are set at different signal light phases, and the south-north main road left-turn traffic flow and the north-south main road right-turn traffic flow are set at different signal light phases.

[0009] Preferably, during both the morning rush hour period and the non-morning rush hour period, the traffic lights use five signal light phases to allocate road traffic resources.

[0010] Furthermore, during the morning rush hour and non-morning rush hour, the traffic lights are controlled to release vehicles according to the A phase, B phase, C phase, D phase and E phase that rotate in sequence;

[0011] Phase A only allows straight traffic from north to south on the main road, right-turn traffic from north to south on the main road, straight traffic from south to north on the main road, and right-turn traffic from south to north on the main road to pass;

[0012] The B phase only allows left-turning traffic on the north-east main road, right-turning traffic on the east-north main road, right-turning traffic on the east-north tunnel, left-turning traffic on the south-west main road, right-turning traffic on the south-east main road, right-turning traffic on the west-south main road, and right-turning traffic on the west-south tunnel;

[0013] The C phase only allows through traffic from east to west in the tunnel, through traffic from west to east in the tunnel, and through traffic from west to east on the main road;

[0014] The D phase only allows through traffic from east to west on the main road, through traffic from west to east in the tunnel, and through traffic from west to east on the main road;

[0015] The E phase only allows right-turning traffic on the north-west main road, left-turning traffic on the east-south main road, left-turning traffic on the east-south tunnel, right-turning traffic on the south-east main road, left-turning traffic on the west-north main road, and left-turning traffic on the west-north tunnel.

[0016] Furthermore, the traffic light adjusts the signal configuration scheme in real time according to formula (1) and formula (2); (1); (2);

[0017] In formula (1) and formula (2), g min is the lower limit of green light time, C is the signal period, For the j The green-to-signal ratio of the phase, g max The upper limit of green light time. L is the sum of the yellow light time and the red light time in a cycle. C max is the upper limit of the signal period, q i For the i The traffic volume of the lane, r is the upper limit of road traffic saturation, In a signal cycle i The total green-to-signal ratio of the lane, S i For the i The saturated flow of the lane, d i For the i All vehicles in the lane are delayed. h i For the i The average number of stops in a lane.

[0018] Furthermore, the g min 5 to 25 seconds.

[0019] Furthermore, the g max It is 30 to 90 seconds.

[0020] Furthermore, the Cmax It is 120 to 240 seconds.

[0021] Furthermore, the Calculated according to formula (3);

[0022] (3);

[0023] In formula (3), the phase matrix is a 0-1 matrix.

[0024] Furthermore, the d i Calculated according to formula (4);

[0025] (4).

[0026] Furthermore, the h i Calculated according to formula (5);

[0027] (5).

[0028] Beneficial effects of the present invention:

[0029] 1) According to the structural characteristics of the intersection connecting the tunnel entrance and exit, the present invention sets the straight traffic flow from the east to west main road and the straight traffic flow from the east to west tunnel at different signal light phases, thereby avoiding the road conflict between the vehicles driving from the east exit main road to the west tunnel entrance road or auxiliary road and the vehicles driving from the east tunnel exit road to the west entrance main road; on the other hand, the left-turning traffic flow from the south to north main road and the right-turning traffic flow from the north to south main road are set at different signal light phases, thereby avoiding the road conflict between the vehicles driving from the north exit main road to the west entrance main road and the vehicles driving from the south exit main road to the west tunnel entrance road or auxiliary road, ultimately effectively improving the congestion phenomenon at the intersection connecting the tunnel entrance and exit;

[0030] 2) By changing the traffic lights from the original four different signal light phases during the morning peak period and the non-morning peak period to the same five signal light phases during the morning peak period and the non-morning peak period, the difficulty of managing the intersection can be reduced to a certain extent;

[0031] 3) By enabling traffic lights to automatically adjust signal configurations based on actual traffic conditions using specific formulas, the release method at intersections connecting tunnel entrances and exits can be made more intelligent.

[0032] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a diagram of congestion at a traditional intersection connecting the tunnel entrance and exit during the morning rush hour;

[0034] Figure 2 It is a traditional traffic light phase diagram of the intersection connecting the tunnel entrance and exit during the morning rush hour;

[0035] Figure 3 This is a diagram of congestion at a traditional intersection connecting tunnel entrances and exits during non-peak hours;

[0036] Figure 4 It is a traditional signal light phase diagram of the intersection connecting the tunnel entrance and exit during non-peak hours;

[0037] Figure 5 The signal light phase diagram of the intersection connecting the tunnel entrance and exit during the morning rush hour and the non-morning rush hour period of the present invention;

[0038] Figure 6 It is a work flow chart of the traffic signal light of the present invention.

[0039] In the figure: 1- North Exit Main Road, 2- North Entrance Main Road, 3- East Tunnel Exit Road, 4- East Exit Main Road, 5- East Entrance Main Road, 6- South Exit Main Road, 7- South Exit Main Road, 8- West Exit Main Road, 9- West Tunnel Exit Road, 10- West Entrance Main Road, 11- West Tunnel Entrance Road, 12- Auxiliary Road. DETAILED DESCRIPTION

[0040] See also Figure 5 The release method for the intersection connected to the tunnel entrance and exit of the present invention makes the east-to-west main road straight-through traffic and the east-to-west tunnel straight-through traffic be arranged at different signal light phases, and makes the south-to-north main road 1 and the north-to-south main road 2 and the north-to-south main road 5 and the left-turning traffic on the south-to-north main road and the right-turning traffic on the north-to-south main road be arranged at different signal light phases.

[0041] During the morning rush hour and non-morning rush hour, the traffic lights use five signal light phases to allocate road traffic resources; specifically, during the morning rush hour and non-morning rush hour, the traffic lights use the following rotation of phase A, phase B, phase C, phase D and phase E to control vehicle release:

[0042] Phase A only allows straight traffic from north to south on the main road, right-turn traffic from north to south on the main road, straight traffic from south to north on the main road, and right-turn traffic from south to north on the main road to pass;

[0043] The B phase only allows left-turning traffic on the north-east main road, right-turning traffic on the east-north main road, right-turning traffic on the east-north tunnel, left-turning traffic on the south-west main road, right-turning traffic on the south-east main road, right-turning traffic on the west-south main road, and right-turning traffic on the west-south tunnel;

[0044] The C phase only allows the through traffic from east to west in the tunnel, the through traffic from west to east in the tunnel, and the through traffic from west to east on the main road; that is, in the C phase, the through lanes of the east tunnel exit road 3, the through lanes of the west exit main road 8, and the through lanes of the west tunnel exit road 9 are green, and the through lanes of the east exit main road 4 are red.

[0045] The D phase only allows the through traffic from the east to west main road, the west to east tunnel through traffic and the west to east main road through traffic; that is, in the D phase, the through lane of the east exit main road 4, the through lane of the west exit main road 8 and the through lane of the west tunnel exit road 9 are green, and the through lane of the east tunnel exit road 3 is red;

[0046] The E phase only allows right-turning traffic on the north-west main road, left-turning traffic on the east-south main road, left-turning traffic on the east-south tunnel, right-turning traffic on the south-east main road, left-turning traffic on the west-north main road, and left-turning traffic on the west-north tunnel.

[0047] In addition, traffic lights can be adjusted according to real-time traffic conditions; Lanes, for , set i The saturated flow rate of the lane is S i , the traffic volume is q i , No. j The green-to-signal ratio of the phase is and , the phase matrix is a 0-1 matrix, and the signal period is C , then in one signal cycle i The total green-to-signal ratio of the lane is , No. i All lanes are delayed d i and i Average number of stops per lane h i As shown in formula (3), formula (4) and formula (5) respectively:

[0048] (3);

[0049] (4);

[0050] (5);

[0051] At this point, the problem can be optimized to formula (1) and formula (2):

[0052] (1);

[0053] (2);

[0054] in, g min is the lower limit of the green light time (usually 15s), g max The upper limit of the green light time (usually 60s), L is the sum of the yellow light time and the red light time in a cycle. C max is the upper limit of the signal period (usually 180s), r It is the upper limit of road traffic saturation (can be adjusted according to actual needs).

[0055] like Figure 6 As shown in FIG. 1 , for a traffic light, the system can first receive data in real time (such as the saturated flow rate of each lane, the traffic flow rate of each lane, the phase matrix, and the upper limit of the signal cycle, etc.), and then use formulas (1) to (5) to determine whether each data is within a reasonable range, so as to output the results (such as the green light duration of each phase, the signal cycle, and the saturation of each lane, etc.) when each data is within a reasonable range.

[0056] As shown in Table 1 below, by comparing this release method with the traditional release method, the target value optimization rate can reach more than 19% during both the morning peak period and the non-morning peak period.

[0057]

[0058] Table 1 Comparison between the original solution and the optimized solution

[0059] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. A method for releasing traffic at an intersection connecting a tunnel entrance and exit, characterized in that: When connecting the tunnel entrances and exits on the east and west sides of the intersection, the straight traffic on the east-west main road and the straight traffic on the east-west tunnel are set at different signal light phases, and the left-turning traffic on the south-north main road and the right-turning traffic on the north-south main road are set at different signal light phases; During the morning rush hour and non-morning rush hour, the traffic lights use five signal light phases to allocate road traffic resources, and during the morning rush hour and non-morning rush hour, the traffic lights use the A phase, B phase, C phase, D phase and E phase in rotation to control the release of vehicles; Phase A only allows straight traffic from north to south on the main road, right-turn traffic from north to west on the main road, straight traffic from south to north on the main road, and right-turn traffic from south to east on the main road to pass; The B phase only allows left-turning traffic on the north-east main road, right-turning traffic on the east-north main road, right-turning traffic on the east-north tunnel, left-turning traffic on the south-west main road, right-turning traffic on the south-east main road, right-turning traffic on the west-south main road, and right-turning traffic on the west-south tunnel; The C phase only allows through traffic from east to west in the tunnel, through traffic from west to east in the tunnel, and through traffic from west to east on the main road; The D phase only allows through traffic from east to west on the main road, through traffic from west to east in the tunnel, and through traffic from west to east on the main road; The E phase only allows right-turning traffic on the north-west main road, left-turning traffic on the east-south main road, left-turning traffic on the east-south tunnel, right-turning traffic on the south-east main road, left-turning traffic on the west-north main road, and left-turning traffic on the west-north tunnel; Enable the traffic lights to adjust the signal configuration scheme in real time according to formula (1) and formula (2); （1）； Min (2); In formula (1) and formula (2), g min is the lower limit of green light time, C is the signal period, For the j The green-to-signal ratio of the phase, g max The upper limit of green light time. L is the sum of the yellow light time and the red light time in a cycle. C max is the upper limit of the signal period, q i For the i The traffic volume of the lane, r is the upper limit of road traffic saturation, In a signal cycle i The total green-to-signal ratio of the lane, S i For the i The saturated flow of the lane, d i For the i All vehicles in the lane are delayed. h i For the i Average number of stops in the lane; Said Calculated according to formula (3); （3）； In formula (3), the phase matrix is a 0-1 matrix; Said d i Calculated according to formula (4); （4）； Said h i Calculated according to formula (5); （5）。 2. The method for releasing traffic at an intersection connecting a tunnel entrance and exit as claimed in claim 1, characterized in that: Said g min 5 to 25 seconds.

3. The method for releasing traffic at an intersection connecting a tunnel entrance and exit as claimed in claim 1, characterized in that: Said g max It is 30 to 90 seconds.

4. The method for releasing traffic at an intersection connecting a tunnel entrance and exit as claimed in claim 1, characterized in that: Said C max It is 120 to 240 seconds.

Images