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Delay time coefficient-based highway travel time reliability calculating method

A technology of travel time and expressways, which is applied in computing, traffic control systems, data processing applications, etc., can solve the problems that travel time is difficult to determine, and it is difficult to accurately reflect the reliability of the actual road network.

Inactive Publication Date: 2017-07-18
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two methods are effective in calculating the travel time reliability of a single road, but for a large-scale road network, because the design speed of each road is different, the actual vehicle speed varies greatly, and the calculation of all vehicle speeds and the average speed is relatively difficult. Difficult to accurately reflect the reliability of the actual road network operation
However, in the method of using BPR function to calculate the travel time of a road segment, since the capacity of a road segment is a random variable, the travel time is not easy to determine, and this method calculates the travel time of a single road segment instead, but it does not directly reflect its reliability.

Method used

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  • Delay time coefficient-based highway travel time reliability calculating method
  • Delay time coefficient-based highway travel time reliability calculating method
  • Delay time coefficient-based highway travel time reliability calculating method

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Experimental program
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Embodiment 1

[0038] A method for calculating reliability of expressway travel time based on delay time coefficient, comprising the following steps:

[0039] S1: Select the road network, determine the number n of its roads, and determine the start and end points of each road;

[0040] S2: Set the maximum speed limit as v, take the design speed of the expressway, and obtain the travel time per unit distance as the minimum unit travel time t min ; Calculate the unit travel time from the average travel speed of each expressway, the average travel speed is the mean value of the average speed of all vehicles in the set time range and the set section of the expressway, and find the unit travel time of the i-th expressway t i and the smallest unit travel time t min The ratio of , called the travel time coefficient Δ i , whose mean is Δ x ,Δ x The value of is calculated using the following formula:

[0041]

[0042] In the formula, i=1,...,n, n is the number of roads; Δ x is the travel ti...

Embodiment 2

[0067] The new method of travel time reliability (based on the delay time coefficient) is compared with other methods:

[0068] It is assumed that the number of vehicles on each road in the expressway network is the same, and it is assumed that the speed of all vehicles in the road network obeys a normal distribution. When the maximum speed limit and near blocking speed are given, R t Only related to the speed of each road, reflected in the formula as Δ x and Δ x,80 There are two variables, so it can be divided into two cases, that is, the reliability of travel time on congested roads under different travel time coefficients and the reliability of travel time on congested roads under different delay time coefficients.

[0069] Given the average vehicle speed v near the blocking state d = 10km / h, the maximum speed limit of each expressway is 120km / h, and the blocking coefficient can be calculated by formula (2) as Δ d =11.

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Abstract

The present invention discloses a delay time coefficient-based highway travel time reliability calculating method. Highway travel time reliability can be monitored and issued via collecting, processing and issuing of all kinds of information based on highway traffic data detection; running of vehicles on a highway is guided and controlled, and therefore highway travel time reliability can be improved. Along with further promotion of a super-ministry system, conception of the system shall be adopted by the highway; coordination among different regions, different departments and different industries needs to be facilitated; a support system providing emergency rescue is made available; linkage among departments of road administration, operation, traffic police, medical treatment, fire fighting and the like is enabled; highway travel time reliability can be well ensured for travelers.

Description

technical field [0001] The invention relates to the technical field of expressway management, in particular to a method for calculating the reliability of expressway travel time based on delay time coefficients. Background technique [0002] Travel time reliability describes the probability that a transportation trip can be completed within a certain time frame. The methods to calculate travel time reliability mainly include travel time reliability based on coefficient of variation and travel encounter index. [0003] The travel time reliability based on the coefficient of variation is to count the travel time data of the vehicle, and its coefficient of variation is used as the travel time reliability; the travel time reliability method based on the delayed travel index is to arrange the travel time in order from small to large, and use the travel encounter Index to represent the unreliability of the road network. The coefficient of variation index can be used to eliminate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/01G06Q10/04
CPCG06Q10/04G08G1/0129
Inventor 郭瑞军王颜萍牛树云孙晓亮张佳鹏
Owner DALIAN JIAOTONG UNIVERSITY
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