Expressway cliff type speed measurement equipment discovery method

Abstract

According to the expressway cliff type speed measurement equipment discovery method provided by the invention, the cliff type suspected equipment set can be accurately and efficiently found by utilizing the existing motor vehicle speed measurement equipment record information database and the free internet map tool, and reliable data support is provided for a traffic management part. Software and hardware devices do not need to be added, and the cost of the scheme is low; moreover, the method is high in robustness, can be suitable for the detection of all cliff-type speed measurement devices of highways, and can also be used for the detection of cliff-type speed measurement devices of first-level highways.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent traffic control, and in particular to a method for discovering cliff-type speed measuring equipment on a highway. Background Art

[0002] Motor vehicle speed measuring equipment is a technical device used to collect evidence of speeding behavior, and plays a vital role in traffic management. Common types of speed measuring equipment include: single-point speed measuring equipment and interval speed measuring equipment, which can monitor the speed of vehicles on the road in real time, capture and record speeding vehicles, deter speeding behavior, significantly reduce the risk of traffic accidents, and effectively improve road safety. At the same time, the widespread use of speed measuring equipment can remind drivers to abide by traffic rules and enhance the public's awareness of traffic safety. In the current intelligent traffic control method, the use of speed measuring equipment to achieve automated and intelligent traffic management, reduce manual intervention monitoring, and help optimize the allocation of police force in traffic management work and improve the level of traffic management.

[0003] However, at the same time, the setting of motor vehicle speed measuring equipment should be scientific and standardized, otherwise it will have a negative impact on traffic management work, and the "cliff-type" speed measuring equipment is a typical situation that needs to be paid special attention to and avoided as much as possible. "Cliff-type" speed measuring equipment refers to the same road, where the speed limit difference between the speed limit signs of the upstream and downstream roads is too large, and the speed measuring equipment set up in the downstream low-speed limit section is called "cliff-type" speed measuring equipment. The setting of "cliff-type" speed measuring equipment may cause the driver to suddenly slow down significantly, resulting in the vehicle behind not being able to react in time and causing a rear-end collision.

[0004] Although the speed measuring equipment is usually optimized based on the road conditions during initial setup to prevent this situation from occurring. However, in real life, the speed limits of some speed measuring equipment may be adjusted due to various reasons such as urban road construction; after a highway has been used for a long time, this "cliff-like" speed measurement phenomenon may occur. In the prior art, there is no specific judgment method for "cliff-like" speed measuring equipment. Most of the time, problems are discovered in the report data after an accident occurs, or they can only be discovered or rectified by investing a large amount of manpower in regular manual inspections, which brings great inconvenience to actual production and life. Summary of the invention

[0005] In order to solve the problem that the existence of cliff-type speed measurement devices cannot be discovered in time in the prior art, the present invention provides a method for discovering cliff-type speed measurement devices on highways, which can actively discover suspected cliff-type speed measurement devices and help improve the processing efficiency of cliff-type speed measurement devices.

[0006] The technical solution of the present invention is as follows: a method for discovering a cliff-type speed measuring device on a highway, characterized in that it comprises the following steps: S1: Determine the highway L to be detected; S2: Obtain the motor vehicle speed measuring devices installed in the upbound direction and the downbound direction of the expressway L respectively; The filing information set of motor vehicle speed measuring equipment includes: Uplink filing information set D 上 and downstream filing information set D 下 ; The registration information of motor vehicle speed measuring equipment includes: equipment number, direction type, longitude and latitude, section code of the speed measurement start location and speed limit value; S3: traverse the set D separately 上 and D 下 , according to the filing information of two adjacent speed measuring devices, the speed limit value difference between the two adjacent speed measuring devices is calculated one by one to form a set of speed limit values ​​of adjacent speed measuring devices; S4: taking out each difference value from the set of speed limit values ​​of adjacent speed measuring devices one by one and comparing it with a preset cliff evaluation threshold t; If there is a difference greater than t, the difference is recorded as: the difference to be judged; S5: obtaining serial numbers of two adjacent speed measuring devices associated with the difference to be determined, and recording the device located in the downstream direction of the road section where the device is located as a suspected device; and forming a suspected device set Sus with all the suspected devices; S6: Obtain the longitude and latitude information of each device in the suspected device set Sus, and mark them on the Internet map; S7: Determine whether there is a suspicious device installed on the special road section. If so, delete the suspicious device installed on the special road section from the suspicious device set Sus, and obtain the final set, which is recorded as the cliff-type suspicious device set Euip.

[0007] It is further characterized by: It also includes the following steps: S8: regularly executing steps S2 to S7 according to a preset monitoring time period, and regularly monitoring the highway L to be detected; The special road sections include: bridges, tunnels and curves; The uplink filing information set D 上 (d1,d2,…,d i ,…,d n ) and the downstream filing information set D 下 (d'1,d'2,…,d' j ,…,d' m ); Among them, d iIndicates the registration information of a speed measuring device on the L upward direction of the expressway; 1≤i≤n, n is a natural number, indicating the total number of motor vehicle speed measuring devices on the L upward direction of the expressway; d' j Indicates the registration information of a speed measuring device on the downlink direction of expressway L, 1≤j≤m, m is a natural number, indicating the total number of motor vehicle speed measuring devices on the downlink direction of expressway L; The uplink filing information set D 上 (d1,d2,…,d i ,…,d n ) i Sort the code of the road section where the speed measurement starts from the largest to the smallest; The downlink filing information set D 下 (d'1,d'2,…,d' j ,…,d' m ) j Sort the speed measurement start location road section codes from small to large; The cliff evaluation threshold t is the difference between the speed limit value of the upstream speed measuring device and the speed limit value of the downstream speed measuring device between adjacent devices, and t takes a positive value; The cliff evaluation threshold t is set to 30 km / h.

[0008] The present application provides a method for discovering cliff-type speed measuring devices on highways. By using the existing motor vehicle speed measuring device registration information database and free Internet map tools, a collection of suspected cliff-type speed measuring devices can be accurately and efficiently found, providing reliable data support for traffic management. The method does not require the addition of new software and hardware devices, and the cost of the solution is low; moreover, the method has strong robustness and can be applied to the detection of cliff-type speed measuring devices on all highways, and can also be extended to the detection of cliff-type speed measuring devices on first-class highways. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A flowchart of the method for discovering cliff-type speed measuring devices on highways; Figure 2 For example, the location of a highway tunnel; Figure 3 This is an example of a highway bridge location; Figure 4 This is an example of the location of a sharp curve on a highway; Figure 5 An example of marking device information on an Internet map; Figure 6 This is an example of a collection of information for filing a motorized speed measuring device. DETAILED DESCRIPTION

[0010] like Figure 1As shown, the present application includes a method for discovering cliff-type speed measuring equipment on a highway, which includes the following steps.

[0011] S1: Determine the highway L to be detected.

[0012] S2: Obtain the motor vehicle speed measuring devices installed in the upbound direction and the downbound direction of the expressway L respectively; The filing information set of motor vehicle speed measuring equipment includes: Uplink filing information set D 上 and downstream filing information set D 下 ; The registration information of motor vehicle speed measuring equipment includes: equipment number, direction type, longitude and latitude, section code of the speed measurement start location and speed limit value.

[0013] Once the expressway L to be inspected is determined, the motor vehicle speed measuring devices installed in the upward and downward directions of the expressway L can be known.

[0014] Uplink filing information set D 上 (d1,d2,…,d i ,…,d n ) and downstream filing information set D 下 (d'1,d'2,…,d' j ,…,d' m ); Among them, d i It indicates the registration information of a speed measuring device on the L upward direction of the expressway; 1≤i≤n, n is a natural number, indicating the total number of motor vehicle speed measuring devices on the L upward direction of the expressway.

[0015] d' j It indicates the registration information of a speed measuring device on the downlink direction of expressway L, 1≤j≤m, m is a natural number, indicating the total number of motor vehicle speed measuring devices on the downlink direction of expressway L.

[0016] The specific implementation is that the uplink filing information set D 上 (d1,d2,…,d i ,…,d n ) i Sort by the code of the road section where the speed measurement starts from the largest to the smallest; Downstream filing information set D 下 (d'1,d'2,…,d' j ,…,d' m ) in d' j Sort the speed measurement start location road section codes from small to large.

[0017] like Figure 6As shown in the figure, it is an example of the registration information set of motor vehicle speed measuring equipment in the up and down directions of the highway L in this embodiment. It can be seen that in this embodiment, referring to the column "Speed ​​Measurement Start Location Section Code" in the figure, it can be seen that the section codes associated with the speed measuring equipment included in the highway L are from 210 to 405 in the down direction and 830 to 1165 in the up direction. There are 10 speed measuring equipment in each direction, and the equipment numbers are: d'1~ d' 10 , and d1~d10.

[0018] S3: traverse the set D separately 上 and D 下 ,According to the filing information of two adjacent speed measuring devices, the speed limit value difference between the two adjacent speed measuring devices is calculated one by one to form a set of speed limit values ​​of adjacent speed measuring devices.

[0019] The speed limit difference between two adjacent speed measuring devices in the uplink direction is recorded as: Dis 上 z，z+1 , the downlink direction is recorded as: Dis 下 z，z+1 , where z is 1≤z≤9.

[0020] In this application, the zth device is located upstream of the z+1th device. Assume that the speed limit value of the zth device is LSM z , the speed limit value of the z+1th device is LSM z+1 , then: Dis 上 z，z+1 =LSM z -LSM z+1 .

[0021] The following results can be obtained: Dis 上 1,2 =10,Dis 上 2,3 =-10, Dis 上 3,4 =40,Dis 上 4,5 =-30, Dis 上 5,6 =-10, Dis 上 6,7 =0,Dis 上 7,8 =40,Dis 上 8,9 =-30, Dis 上 9,10 =-30.

[0022] Dis 下1,2 =0,Dis 下 2,3 =0,Dis 下 3,4 =40,Dis 下 4,5 =-40, Dis 下 5,6 =10,Dis 下 6,7 =10,Dis 下 7,8 =-20, Dis 下 8,9 =0,Dis 下 9,10 =10.

[0023] S4: In the set of speed limit values ​​of adjacent speed measuring devices, each difference is taken out one by one and compared with the preset cliff evaluation threshold t; If there is a difference greater than t, the difference is recorded as: the difference to be determined.

[0024] The cliff evaluation threshold t is the difference between the speed limit value of the upstream speed measuring device and the speed limit value of the downstream speed measuring device between adjacent devices, and t takes a positive value. In actual applications, when there is a large difference between two adjacent speed measuring devices, it may be that the speed limit value of the downstream device is too small, or the speed limit value of the upstream device is too large. However, based on actual roads, only when the speed limit value of the speed measuring device in the downstream direction is too small, it may cause the driver to suddenly slow down significantly, resulting in the rear vehicle not being able to react in time and causing a rear-end collision. Therefore, in traffic management, the speed measuring device set up on the downstream low-speed limit section is called a "cliff-type" speed measuring device. This method will also only focus on the situation where the speed limit value of the downstream speed measuring device is too small. Therefore, when calculating the difference between adjacent devices, the speed limit value of the upstream device is used. That is, Dis 上 z，z+1 or Dis 下 z，z+1 For positive value.

[0025] The setting of the t value is set according to the specific situation of the highway L to be detected. In this embodiment, the cliff evaluation threshold t is set to 30 km / h.

[0026] According to the above calculation results, the differences that meet the conditions that the difference is positive and greater than t are as follows: Dis 上 3,4 =40,Dis 上 7,8 =40,Dis 下 3,4 =40; Then, the Dis 上 3,4 、Dis 上 7,8 , and Dis in the downlink direction 下 3,4 Recorded as the difference to be judged.

[0027] S5: Obtain the serial numbers of two adjacent speed measuring devices associated with the difference to be determined, and record the device located in the downstream direction of the road section where the device is located as a suspected device; and form a suspected device set Sus with all the suspected devices.

[0028] Suspect device set Sus = {d4, d8, d'4}.

[0029] S6: Obtain the longitude and latitude information of each device in the suspected device set Sus, and mark them on the Internet map.

[0030] Internet maps can be implemented using commercial third-party map interfaces in existing technologies: such as Baidu Maps, Amap, etc.

[0031] S7: Determine whether there is a suspicious device installed on the special road section. If so, delete the suspicious device installed on the special road section from the suspicious device set Sus, and obtain the final set denoted as: cliff-type suspicious device set Euip.

[0032] Special sections include bridges, tunnels and curves. Because special sections require vehicles to slow down, this is in line with the actual road conditions, not simply due to unreasonable speed limit device settings. Therefore, it is necessary to exclude the deceleration caused by special sections.

[0033] like Figure 2 , Figure 3 and Figure 4 As shown, examples of highway tunnel locations, highway bridge locations, and highway sharp bend locations are marked on Baidu Maps. Due to changes in road conditions, vehicles must slow down in advance on these sections.

[0034] like Figure 5 As shown, the latitude and longitude information of each speed measuring device in the suspected device set Sus is obtained and marked on the Internet map. Combined with the road information, it can be seen that d4 and d'4 are respectively set at the bridge and curve positions, eliminating suspicion; d8 is located at a straight section, and finally the cliff-type suspected device set Euip(d8) is obtained.

[0035] S8: According to a preset monitoring time period, steps S2 to S7 are regularly executed to regularly monitor the highway L to be inspected.

[0036] Because the amount of calculation is small, the method in this application does not need to install new hardware devices, and can be directly run on the existing traffic management platform. The existing traffic management platform obtains the registration information of the speed measuring equipment on the specified highway from the motor vehicle speed measuring equipment registration information database, and then obtains the relevant map information through the interface of the third-party map tool.

[0037] After using the technical solution of the present invention, based on the registered data of the motor vehicle speed measuring equipment, the motor vehicle speed measuring equipment suspected of cliff-type speed measurement is actively discovered, and the special speed limit sections are confirmed in combination with the equipment location information, so as to assist the traffic management department in rectifying the cliff-type speed measuring equipment.

Claims

1. A method for discovering a cliff-type speed measuring device on a highway, characterized in that: It includes the following steps: S1: Determine the highway L to be detected; S2: Obtain the motor vehicle speed measuring devices installed in the upbound direction and the downbound direction of the expressway L respectively; The filing information set of motor vehicle speed measuring equipment includes: Uplink filing information set D 上 and downstream filing information set D 下 ; The registration information of motor vehicle speed measuring equipment includes: equipment number, direction type, longitude and latitude, section code of the speed measurement start location and speed limit value; S3: traverse the set D separately 上 and D 下 , according to the filing information of two adjacent speed measuring devices, the speed limit value difference between the two adjacent speed measuring devices is calculated one by one to form a set of speed limit values ​​of adjacent speed measuring devices; S4: taking out each difference value from the set of speed limit values ​​of adjacent speed measuring devices one by one and comparing it with a preset cliff evaluation threshold t; If there is a difference greater than t, the difference is recorded as: the difference to be judged; S5: obtaining serial numbers of two adjacent speed measuring devices associated with the difference to be determined, and recording the device located in the downstream direction of the road section where the device is located as a suspected device; and forming a suspected device set Sus with all the suspected devices; S6: Obtain the longitude and latitude information of each device in the suspected device set Sus, and mark them on the Internet map; S7: Determine whether there is a suspicious device installed on the special road section. If so, delete the suspicious device installed on the special road section from the suspicious device set Sus, and obtain the final set, which is recorded as the cliff-type suspicious device set Euip.

2. According to claim 1, a method for discovering a cliff-type speed measuring device on a highway is characterized by: It also includes the following steps: S8: According to a preset monitoring time period, steps S2 to S7 are regularly executed to regularly monitor the highway L to be inspected.

3. According to claim 1, a method for discovering a cliff-type speed measuring device on a highway is characterized by: The special road sections include: bridges, tunnels and curves.

4. According to claim 1, a method for discovering a cliff-type speed measuring device on a highway is characterized by: The uplink filing information set D 上 (d1,d2,…,d i ,…,d n ) and the downstream filing information set D 下 (d'1,d'2,…,d' j ,…,d' m ); Among them, d i Indicates the registration information of a speed measuring device on the L upward direction of the expressway; 1≤i≤n, n is a natural number, indicating the total number of motor vehicle speed measuring devices on the L upward direction of the expressway; d' j It indicates the registration information of a speed measuring device on the downlink direction of expressway L, 1≤j≤m, m is a natural number, indicating the total number of motor vehicle speed measuring devices on the downlink direction of expressway L.

5. A method for discovering a cliff-type speed measuring device on a highway according to claim 4, characterized in that: The uplink filing information set D 上 (d1,d2,…,d i ,…,d n ) i Sort the code of the road section where the speed measurement starts from the largest to the smallest; The downlink filing information set D 下 (d'1,d'2,…,d' j ,…,d' m ) j Sort the speed measurement start location road section codes from small to large.

6. A method for discovering a cliff-type speed measuring device on a highway according to claim 1, characterized in that: The cliff evaluation threshold t is the difference between the speed limit value of the upstream speed measuring device and the speed limit value of the downstream speed measuring device between adjacent devices, and t takes a positive value.

7. A method for discovering a cliff-type speed measuring device on a highway according to claim 6, characterized in that: The cliff evaluation threshold t is set to 30 km / h.

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