VISSIM simulation-based method for determining length of accelerating lane in left-in ramp confluence area

Abstract

The invention provides a VISSIM simulation-based method for determining the length of an accelerating lane in a left entrance ramp confluence area. The method comprises the following steps of: acquiring road parameters and traffic flow data of the left entrance ramp confluence area of an expressway; establishing a VISSIM simulation model and an SSAM conflict model; determining simulation times, performing feasibility analysis and sensitivity analysis of default parameters, and completing calibration of correction parameters; designing acceleration lanes with different lengths and lane numbers,and establishing a corresponding VISSIM simulation model; and comparing the average travel delay and the traffic conflict number of the confluence area in each simulation scheme to obtain a design scheme based on optimal traffic operation efficiency and safety. According to the method, traffic flow characteristics are analyzed from two aspects of confluence area operation efficiency and safety, so that a recommended value of the accelerating lane length of the left-in-ramp confluence area is determined.

Description

technical field [0001] The invention belongs to the field of expressway design, and in particular relates to a VISSIM simulation-based method for determining the length of an acceleration lane in a left-in-ramp merge area. Background technique [0002] As the main artery of urban roads, expressways take up a relatively small proportion of the total mileage of urban roads, but bear a large traffic load, and have the characteristics of continuous traffic, small interference, and large capacity. However, during morning and evening rush hours, there are many frictions between vehicles, many potential dangers, and frequent accidents. Once a traffic accident occurs, the severity of the accident is often severe, and the impact on traffic after the accident is also profound. While expressways bring convenience to urban life, the ever-increasing accident rate and accompanying traffic congestion have also caused troubles for urban road traffic managers. [0003] On the layout of the ...

AI Technical Summary

Problems solved by technology

[0004] The traditional formula method to determine the length of the speed-changing lane has been widely used in domestic and foreign norms and academic research. However, there are still some differences between theoretical analysis and practical application, and cannot fully reflect the real operating conditions of the road.

Although the driving behavior characteristics analysis method can make up for the shortcomings of the formula method, it needs to carry out a large number of on-site real vehicle investigations, and it is difficult to be widely used due to its high cost and long time-consuming investigation.

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