Method for calculating traffic capacity in city expressway entrance interlacing region

Abstract

The invention discloses a method for calculating the traffic capacity in a city expressway entrance interlacing region, and aims at filling a gap that there is short of a calculation method for effectively estimating the traffic capacity. The method comprises the following steps: 1, collecting related traffic parameters of an expressway interlacing region: 1), the mean time headway (shown in the description) of the traffic flow of an expressway trunk line Ls; 2), a critical time gap tC which allows ramp vehicles to merge into the expressway trunk line Ls; 3), the time headway th between two ramp vehicles; 4), the flow Q of the expressway trunk line Ls; 5), the distance L between a nasal tip N and a merging point of an accelerating vehicle La; 6), the design speed V1 of the expressway trunk line Ls; 7), the design speed V of a ramp; 2, calculating the probability distribution parameter K of the time headway of the expressway trunk line Ls; 3, building a method for calculating the traffic capacity of the ramp R; 4, improving the method for calculating the traffic capacity of the ramp R; 5, calculating the traffic capacity of the interlacing region through employing a formula (shown in the description), wherein CM is the traffic capacity of the interlacing region, the unit is vehicles / hour, and delta t is the time different of the ramp vehicle M2 and a trunk line vehicle M1 (unit is second).

Description

technical field [0001] The present invention relates to a method for calculating the capacity of expressway, more precisely, the invention relates to a method for calculating the capacity of interweaving area at the entrance of urban expressway based on gap acceptance theory. Background technique [0002] In the urban expressway weaving area, two independent traffic flows merge into one vehicle flow, so the expressway weaving area is considered to be a traffic congestion-prone area. A reasonable calculation method of traffic capacity is of great significance for the evaluation of the degree of congestion in the weaving area and the evaluation of complex traffic conditions. Although there are many calculation methods for the capacity of the weaving area, the existing methods do not consider the geometric conditions and design speed of the weaving area. The influence of traffic capacity, and the calculation method is complex, lacking a simple and mature calculation method for ...

AI Technical Summary

Problems solved by technology

A reasonable calculation method of traffic capacity is of great significance for the evaluation of the degree of congestion in the weaving area and the evaluation of complex traffic conditions. Although there are many calculation methods for the capacity of the weaving area, the existing methods do not consider the geometric conditions and design speed of the weaving area. The influence of traffic capacity, and the calculation method is complex, lacking a simple and mature calculation method for the traffic capacity of the weaving area

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