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Speed limit determining method based on safety

A technology to determine the method and safety, which is applied in the field of traffic safety and can solve problems such as inconsistent speed limits

Inactive Publication Date: 2010-08-18
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, when the model considers the safety constraints, it only uses the data of the National Institute of Serious Accidents (NCSS), and does not take into account the characteristics of road traffic accidents in my country. The speed limit value obtained by this method does not match the actual situation.

Method used

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  • Speed limit determining method based on safety
  • Speed limit determining method based on safety
  • Speed limit determining method based on safety

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0110] Car:

[0111] Step 1: Collect data

[0112] The K22230-K2229 section of Qinglian Expressway in Guangdong was selected as the research object, about 1 km away, towards Lianzhou. The design speed of this section is 100km / h, the radius of the flat curve is 1000 meters, the longitudinal slope is 3%, the one-way average hourly traffic volume is 1000 vehicles / h, the annual average daily traffic volume of small cars is 18000 vehicles / h, and the annual average daily traffic volume of large vehicles is 18000 vehicles / h. The traffic volume is 6000 vehicles / h.

[0113] Step 2: Calculate the expected road safety level of the section

[0114] E(Crashy)=EXP(0.332-0.002Hourflow+1.040×10 -5 Hourflow 2 -4.220×10 -9 Hourflow 3 )=exp(0.332-0.002*1000+1.04*10 -5 *1000 2 -4.22*10 -9 *1000 3 )=54

[0115] Step 3: Calculate the traffic risk exposure index

[0116] EXPO=Hourflow*L=1000

[0117] Step 4: Calculate the critical speed limit value

[0118] EXPO*Exp[-18.032+2.735Ln(V ...

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Abstract

The speed limit of a vehicle should ensure the efficiency and the safety, but an interactive relationship exists between the efficiency and the safety. Based on the safety constraint conditions, the invention comprises the following five steps: 1. establishing a limit speed model with respect to the safety based on the principle that the speed limit on a highway should ensure that the accident death rate is less than an acceptable tolerance value; 2. determining the limit speed and a 85% speed relation model; 3. establishing a traffic accident prediction model; 4. quantifying the traffic safety service level, wherein the accident rate is used as an index for quantifying the safety service level; and 5. establishing a time-cost function of a high-grade highway based on the 85% speed and the design speed, and establishing an objective function of the operating efficiency by using the minimum time-cost. The invention establishes a limit speed optimization model using the operating efficiency as the objective function, and can calculate the optimum speed limit in the specific benefit orientation by using the limit speed optimization model.

Description

technical field [0001] The invention is a method for determining a speed limit value obtained under the constraints of safety factors, which can obtain the optimal speed limit value under a specific benefit orientation, and belongs to the field of traffic safety. Background technique [0002] Speed ​​limit is an important management method in road traffic management and control. With the development of road construction in recent years, the improvement of road traffic conditions, the general improvement of driver's driving quality and the enhancement of motor vehicle performance, according to the design speed or experience Therefore, it is necessary to study this problem and find a reasonable and scientific design method of highway speed limit value to meet the needs of highway traffic management. [0003] Based on the optimization theory of operations research, Dr. Cheng Guozhu of Harbin Institute of Technology in my country established a mathematical model with the minimum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/00G08G1/052
CPCY02T10/56Y02T10/40
Inventor 贺玉龙孙小端钟小明张杰鲍兴建侯树展王华荣
Owner BEIJING UNIV OF TECH
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