R language implementation method for active safety design of urban discrete traffic network

Abstract

The present invention provides a solution algorithm for the urban discrete traffic network model based on active safety and implements it by using R language program. The invention adopts speed coordination as an alternative index of network security level, establishes a two-layer planning model for urban discrete traffic network design, and advances active safety evaluation to the road network planning stage. The main steps include: (1) Determine the active safety evaluation method based on speed coordination; (2) Establish a two-level programming model for urban discrete traffic network design, in which the upper-level planning takes network security as the policy goal, and the lower-level planning takes user balance as the policy (3) Iterative optimization algorithm is used to solve the model; (4) R language program is designed to realize the solution method; (5) The specific implementation method is described in combination with the Nguyen-Dupuis network commonly used in traffic network analysis. Using R language to solve the model has technical advantages such as open source, free, and strong operability.

Description

Technical field: [0001] Aiming at the problem of urban discrete traffic network design based on active safety, the invention establishes a mathematical model, designs a solution algorithm, and implements an operable computer software by using R language, which belongs to the technical field of traffic engineering. Background technique: [0002] Traditional traffic safety management is to diagnose and identify dangerous road sections and accident black spots through statistical analysis of a large number of accidents during road operation, and then propose corresponding improvement measures. Usually, it is affected by problems such as huge reconstruction costs, difficulty in collecting accident data, and the accuracy of data, and has little effect. At the same time, because post-event remedial measures are mostly limited to traffic engineering methods, the improvement effect on many dangerous road sections caused by road planning and design and other factors Poor, can not fun...

AI Technical Summary

Problems solved by technology

[0006] Technical issues: At this stage, traffic planning software is basically foreign products, which are expensive, complicated to operate, and difficult to use. In particular, insufficient consideration is given to safety, and there is a lack of core technologies for effective prediction and measurement evaluation of traffic safety levels

Images