CN100541553C - Data collection and processing methods of road traffic accidents - Google Patents

Abstract

The road traffic accident information collection and processing method involves determining the implementation scope of traffic control, signal control, information induction and other rapid traffic handling measures according to the traffic accident information after the road traffic accident occurs, and calculating the traffic congestion caused by the traffic accident. The length L, the queue length coverage area is called the congestion area; the congestion area and diversion path are merged into the candidate area information; the regional total travel time _T2 after the traffic flow in the candidate area is redistributed is obtained; the change of the regional total travel time is determined Index λ=((T ₂ -T ₁ )/T ₁ )×100%; within the scope of the candidate area, the measures to deal with traffic accidents should be taken quickly; judge whether the search radius R is greater than or equal to 2000 meters, if yes , then the information on the rapid handling measures for traffic accidents that should be taken in each candidate area is transmitted to the host computer of the traffic management department through the data transmission interface; otherwise, the search radius R is extended by 300 meters.

Description

Data collection and processing methods of road traffic accidents

technical field

The present invention relates to determining the implementation scope of rapid traffic handling measures such as traffic control, signal control, and information guidance according to traffic accident information after road traffic accidents occur, so as to improve the implementation efficiency of various traffic handling measures and effectively alleviate accidents. The effect of on-site traffic pressure, reducing motor vehicle delays and avoiding further spread of traffic congestion. The utility model belongs to the field of urban road traffic control.

Background technique

With the development of my country's economy and society and the improvement of people's living standards, cars have gradually entered the family, and the number of urban car ownership has increased rapidly. What follows is the frequent occurrence of urban road traffic accidents, which not only cause casualties and property losses, but also easily lead to a decrease in the actual capacity of the road, causing occasional urban traffic congestion.

For this reason, urban traffic management departments need to quickly deal with traffic accidents, divert on-site traffic, and avoid and reduce occasional urban traffic congestion caused by traffic accidents. However, the current rapid traffic handling measures taken for traffic accidents are often limited to: road traffic control in a small area by the traffic police and radio, and broadcast large-scale information release. Due to the single traffic rapid disposal measures, it was not possible to organically combine and comprehensively apply various disposal measures such as traffic control, signal control, and information induction to improve the rapid disposal capacity.

The long-term research of the inventors has found that with the continuous improvement of traffic infrastructure construction, large and medium-sized cities in my country have fully equipped the hardware conditions for the comprehensive application of various traffic disposal measures. At present, it is impossible to comprehensively apply various traffic disposal measures and maximize the effectiveness of various disposal measures. The main reason is that: traffic control, signal control, information guidance and other rapid traffic disposal methods have their own characteristics and scope of application. Due to road traffic accidents Due to the sporadic nature of traffic accidents, it is impossible to determine the application area of various rapid disposal measures in a timely manner based on traffic accident information. Therefore, simple measures such as implementing traffic control in a small area and releasing event information in a large area can only be taken to alleviate the traffic pressure at the incident site. If we can quickly determine the scope of implementation of various traffic handling measures based on traffic accidents and the traffic status in surrounding areas, and comprehensively apply various traffic handling measures, we can maximize the role of various traffic handling methods and significantly improve road traffic accidents. Ability to quickly handle incidents.

Contents of the invention

Technical problem: the purpose of this invention is to provide a kind of road traffic accident information collection and processing method, aiming at the impact of road traffic accident on the scene of the accident, by redistributing the road traffic flow in the connected area, the information before and after the accident is obtained. Changes in the total travel time in the region, determine the implementation scope of different types of traffic rapid disposal measures, facilitate the effective implementation and coordinated operation of various traffic rapid disposal measures, improve disposal efficiency, and avoid unnecessary negative impacts on normal traffic.

Technical solution: the road traffic accident information collection and processing method of the present invention is:

1) According to the automatic detection system of traffic accidents, determine the number n of motor vehicle lanes occupied by traffic accidents, the traffic flow Q and direction affecting the traffic flow, and the processing time t required for traffic accidents, based on the basic formula of parking wave in the traffic flow fluctuation theory , calculate the queue length L of traffic congestion caused by traffic accidents, and the area covered by the queue length is called the congestion range,

2) According to the urban traffic road network database and real-time traffic flow data, in the urban traffic road network, with the congestion range as the center and 200 meters as the search radius R, the search service level is higher than the congestion range road service level and the travel time is less than the congestion range The data of the traffic diversion route of the road travel time, the congestion range and the diversion route are merged into the alternative area information,

3) According to the real-time data of traffic flow collected by the urban traffic signal monitoring system and the data of the historical database of urban traffic flow, the real-time traffic flow and historical data of each road section and intersection connected to the candidate area are obtained, and the traffic dredging candidate area is established The traffic volume matrix between each origin-destination point is the OD matrix, and the total regional travel time T ₂ after the traffic flow redistribution in the candidate area is obtained by the "capacity-limited allocation method" in the traffic engineering theory,

4) According to the regional total travel time T ₂ after the traffic flow redistribution in the candidate area and the total travel time T ₁ in the area before the accident, determine the change index of the regional total travel time $\mathrm{\&lambda;}=\frac{T_2-T_1}{{\mathrm{<figure-callout\; id="1"\; label="T"\; filenames="C20071019022300132.png"\; state="\{\{state\}\}">T</figure-callout>}}_1}\&times;100\%,$

5) According to the regional total travel time change index λ and the current time period, obtain the rapid handling measures for traffic accidents within the candidate area,

6) Determine whether the search radius R is greater than or equal to 200 meters, if yes, then proceed to step 7); otherwise, extend the search radius R by 300 meters, and proceed to step 2),

7) Transmit the information on the rapid handling measures for traffic accidents that should be taken within the scope of each candidate area to the host computer of the traffic management department through the data transmission interface, for the implementation of quick handling measures,

8) Before the traffic accident has been dealt with, turn to step 1) every 20 minutes to re-determine the implementation scope of the rapid handling measures for traffic accidents for the implementation of the quick handling measures.

The method of the traffic volume matrix namely OD matrix between each start-to-end point in the described establishment traffic dredging candidate area is:

1.) Use the intersections and road sections connected with the surroundings of the alternative area as the starting and ending points of the alternative area,

2.) Read the real-time data of traffic volume at the origin and destination points collected by the traffic signal monitoring system, and generate the distribution data of traffic occurrence and traffic attraction at each origin and destination point,

3.) From the historical data stored in the traffic flow database, the traffic demand distribution ratio between the origin and destination points is generated,

4.) According to the traffic generation and traffic attraction data of each origin-destination point, and the traffic demand distribution ratio between origin-destination points, establish the traffic volume matrix between each origin-destination point, that is, the OD matrix.

According to the regional total travel time change index λ and the current time period, the rapid handling measures for traffic accidents within the candidate area are obtained as follows:

1.) Judging the current time period: when the hourly traffic flow ratio is greater than 7%, it is determined that this period is a traffic peak period; when the hourly traffic flow ratio is greater than 3% and less than 7%, it is determined that this period is a traffic peak period; If the traffic ratio is less than 3%, it is determined that this period is the traffic trough period,

2.) During the traffic peak period, the area where λ≥100% is a traffic control area, the area where λ≥50% is a signal control area, and the area where λ≥8% is a signal induction area,

3.) During the traffic peak period, the area with λ≥175% is the traffic control area, the area with λ≥75% is the signal control area, and the area with λ≥12% is the signal induced area,

4.) During the traffic trough period, the area with λ≥300% is the traffic control area, the area with λ≥100% is the signal control area, and the area with λ≥20% is the signal induction area.

Beneficial effect:

1. According to the change of the total travel time in the candidate area, judge the traffic treatment measures that should be taken within the scope of the candidate area, so that the selection of traffic treatment measures is more scientific, and the time and space resources of the road can be fully utilized, and the advantages of various traffic treatment measures can be brought into play .

2. The collection and processing of traffic accident data is simple and easy, and it is not affected by human factors. It is convenient to objectively and quickly generate the implementation scope of various disposal measures according to the actual situation of traffic accidents and the traffic conditions in surrounding areas, which is beneficial to The traffic management department comprehensively applies various disposal measures to improve the rapid disposal capacity of urban road traffic accidents.

Description of drawings:

FIG. 1 is a basic flowchart of a method for collecting and processing road traffic accident information.

Fig. 2 is a schematic diagram of the search range of the candidate area.

Figure 3 is a schematic diagram of the local road network structure in the Ming Palace area in Nanjing.

Fig. 4 is a schematic diagram of an alternative area A in the example.

Fig. 5 is a schematic diagram of an alternative area B in the example.

Fig. 6 is a schematic diagram of an alternative area C in the example.

Fig. 7 is a schematic diagram of an alternative area D in the example.

Detailed ways

In conjunction with accompanying drawing, the present invention will be further described:

a. After discovering a road traffic accident, confirm the traffic congestion area caused by the road traffic accident, the actual decline in road capacity and the speed of congestion spread; calculate the event processing time according to the nature, characteristics, and severity of the traffic accident , according to the spread speed of the congestion and the event processing time to determine the range of traffic congestion.

b. Find slow-blocking and diverting road sections to ease the traffic volume in the traffic-congested area and relieve the traffic pressure in the congested area. Take the congestion area as the center, and use 200 meters, 500 meters, 800 meters, 1100 meters... as the radius to find slow-congestion diversion road sections, search for traffic whose service level is higher than the road service level in the congestion area, and travel time is shorter than the travel time of the road in the congestion area For diversion road sections, the congested areas and diversion road sections are merged to establish different alternative areas until the implementation scope of various traffic quick disposal measures is determined.

c. Use the road sections connected to the candidate area and the entrances and exits of intersections as the starting and ending points of the road network in the candidate area. The traffic volume of origin and destination points is regarded as the traffic demand of the road network in the alternative area, and the traffic demand ratio between each origin and destination is determined according to the historical data of traffic volume distribution in each alternative area, and the OD matrix of the alternative area is established.

d. According to the "capacity limit allocation method" in the traffic engineering theory to determine the distribution of regional traffic flow, redistribute the traffic flow in the alternative area, and obtain the total travel time T ₂ obtained from the redistribution of traffic flow in the alternative area.

e. The criteria for determining the implementation scope of various traffic handling measures are based on the total travel time obtained from the redistribution of traffic flow in the candidate area as the evaluation basis. The evaluation index proposed by the inventor is the change index λ of the total travel time in the alternative area, that is, the relative change rate of the total travel time T ₂ obtained from the redistribution of traffic flow in the alternative area after the incident and the total travel time T ₁ in the area before the incident . The regional total travel time change index λ can be used to judge the traffic disposal measures that need to be adopted in the candidate area. When the regional total travel time change index λ is large, it means that the traffic control measures will increase the traffic travel time in the region, which will have a greater impact on the normal driving vehicles in the alternative region, and compulsory control measures, such as traffic control and signal control In order to realize the purpose of traffic diversion and slow down the traffic congestion at the accident site; when the regional total travel time change index λ is small, it means that the traffic diversion has little impact on the normal driving vehicles in the region, and behavior control measures can be taken. Such as information guidance, radio broadcast information, etc., to achieve the purpose of traffic guidance.

According to the inventor's actual investigation and repeated experiments, the standards for determining the implementation scope of various traffic handling measures based on the regional total travel time change index λ are determined in different periods, as shown in Table 1:

Table 1 Standards for division of traffic management areas

Due to the excessive traffic demand of the traffic network during the traffic peak period, the local roads in the city are saturated, and traffic accidents can easily cause traffic congestion. The value of the standard λ for dividing traffic control areas is relatively small. In the traffic peak period and traffic trough period, the urban traffic pressure is relatively small, and the value of the standard λ for dividing the traffic control area can be relatively large.

f. After the implementation scope of various traffic handling measures is determined, it is not fixed. According to the congestion situation of the traffic congestion area and the change of the traffic volume of the traffic road network, the implementation scope of the traffic handling measures should be updated regularly until the traffic accident is handled and the congestion area returns to normal. The regular update period is 20 minutes, mainly for the following reasons: First, the short-term traffic flow is not conducive to the determination of traffic-affected areas. The traffic flow whose statistical time is less than 15 minutes is called short-term traffic flow. Short-term traffic flow has the characteristics of non-linearity, randomness, and high disturbance, and cannot accurately reflect the traffic flow conditions of various road sections and intersections in the area; , too long regular update cycle can not reflect the changes in the range of congestion and urban traffic volume in a timely manner, and it is not convenient for traffic managers to timely correct the implementation range of various traffic disposal measures.

Example: Select the local road network in the Ming Palace area in the urban area of Nanjing as the research object of the invention, and the road network structure is shown in Figure 3. The number in attached drawing 3 is the network node number, and the traffic flow data of the traffic evening peak period is used. The motor vehicle traffic load of the road network is relatively large, and the service level of motor vehicle road sections such as Zhongshan East Road, Zhujiang Road, and Beijing East Road belongs to D Level, which is close to unstable traffic flow, has a large delay, but the driver can bear it.

During the evening peak period, a traffic accident occurred in the direction of node 34 to node 35 of the Shandong route on the main road of the road network. Occasional congestion that did not affect the upstream intersection when the incident was discovered.

The flow of road traffic accident information collection and processing methods, because the accident-occurring section of Zhongshan East Road cannot fully meet the traffic demand of this section, it is necessary to find slow-blocking and diverting sections and establish alternative areas. As shown in Figure 7; for the redistribution of traffic flow in each candidate area, analyze the change index λ of the total travel time in the area, as shown in the following table:

Table 2 λ analysis of regional total travel time change index

According to Table 1, the criteria for determining the implementation scope of various traffic measures based on the regional total travel time change index λ, we can obtain the traffic peak period. The candidate area A is the traffic control area; the candidate area B is the signal control area; the alternate area B is the signal control area; The selected area C is the traffic information guidance range; outside the alternative area C, radio stations and broadcast information release methods can be used.

Claims (3)

1. A road traffic accident information collection and processing method is characterized in that the method is: 1) According to the automatic detection system of traffic accidents, determine the number n of motor vehicle lanes occupied by traffic accidents, the traffic flow Q and direction affecting the traffic flow, and the processing time t required for traffic accidents, based on the basic formula of parking wave in the traffic flow fluctuation theory , calculate the queue length L of traffic congestion caused by traffic accidents, and the area covered by the queue length is called the congestion range, 2) According to the urban traffic road network database and real-time traffic flow data, in the urban traffic road network, with the congestion range as the center and 200 meters as the search radius R, the search service level is higher than the congestion range road service level and the travel time is less than the congestion range The data of the traffic diversion route of the road travel time, the congestion range and the diversion route are merged into the alternative area information, 3) According to the real-time data of traffic flow collected by the urban traffic signal monitoring system and the data of the historical database of urban traffic flow, the real-time traffic flow and historical data of each road section and intersection connected to the candidate area are obtained, and the traffic dredging candidate area is established The traffic volume matrix between each origin-destination point is the OD matrix, and the total regional travel time T ₂ after the traffic flow redistribution in the candidate area is obtained by the "capacity-limited allocation method" in the traffic engineering theory, 4) According to the regional total travel time T ₂ after the traffic flow redistribution in the candidate area and the total travel time T ₁ in the area before the accident, determine the change index of the regional total travel time $\mathrm{\&lambda;}=\frac{T_2-T_1}{T_1}\&times;100\%,$ 5) According to the regional total travel time change index λ and the current time period, obtain the rapid handling measures for traffic accidents within the candidate area, 6) Determine whether the search radius R is greater than or equal to 200 meters, if yes, then proceed to step 7); otherwise, extend the search radius R by 300 meters, and proceed to step 2), 7) Transmit the information on the rapid handling measures for traffic accidents that should be taken within the scope of each candidate area to the host computer of the traffic management department through the data transmission interface, for the implementation of quick handling measures, 8) Before the traffic accident has been dealt with, turn to step 1) every 20 minutes to re-determine the implementation scope of the rapid handling measures for traffic accidents for the implementation of the quick handling measures. 2. road traffic accident information collection and processing method according to claim 1, it is characterized in that the method of the traffic volume matrix i.e. the OD matrix between each origin and destination point in the described establishment of traffic diversion alternative area is: 1.) Use the intersections and road sections connected with the surroundings of the alternative area as the starting and ending points of the alternative area, 2.) Read the real-time data of traffic volume at the origin and destination points collected by the traffic signal monitoring system, and generate the distribution data of traffic occurrence and traffic attraction at each origin and destination point, 3.) From the historical data stored in the traffic flow database, the traffic demand distribution ratio between the origin and destination points is generated, 4.) According to the traffic generation and traffic attraction data of each origin-destination point, and the traffic demand distribution ratio between origin-destination points, establish the traffic volume matrix between each origin-destination point, that is, the OD matrix. 3. The road traffic accident information collection and processing method according to claim 1, characterized in that according to the regional total travel time change index λ and the current time period, obtain the traffic accident that should be taken within the range of this candidate area The quick response measures for the incident are: 1.) Judging the current time period: when the hourly traffic flow ratio is greater than 7%, it is determined that this period is a traffic peak period; when the hourly traffic flow ratio is greater than 3% and less than 7%, it is determined that this period is a traffic peak period; If the traffic ratio is less than 3%, it is determined that this period is the traffic trough period, 2.) During the traffic peak period, the area where λ≥100% is a traffic control area, the area where λ>50% is a signal control area, and the area where λ≥8% is a signal induction area, 3.) During the traffic peak period, the area with λ≥175% is the traffic control area, the area with λ≥75% is the signal control area, and the area with λ≥12% is the signal induced area, 4.) During the traffic trough period, the area with λ≥300% is the traffic control area, the area with λ≥100% is the signal control area, and the area with λ≥20% is the signal induction area.

Images