Speed safety factor-based method for determining road limited speed value

Abstract

The invention relates to a speed safety factor-based method for determining a road limited speed value, which comprises the following steps: collecting basic data, namely design parameters of plane and vertical lines of a road; in three dimensionalities of an axial direction, a horizontal direction and a longitudinal direction, calculating the highest running speed of the road; selecting a proper speed safety factor for each dimensionality; dividing the highest running speeds in the three dimensionalities by the speed safety factors to obtain optical limited speeds of the three dimensionalities, and selecting the minimal value of the three limited speed values as an upper limit of a limited speed aggregate to obtain an initially determined limited speed value; and preferring a limited speed according to the expected speed of a driver. The limited speed value determined by the method reflects the quality of a driving condition, a safety space is reserved, and the driver is easy to observe the limited speed value.

Description

technical field [0001] The invention relates to a method for determining a highway speed limit value, in particular to a method for determining a highway speed limit value based on a speed safety factor, which can be used to set the speed limit value for road vehicles to achieve the purpose of improving driving safety. The invention belongs to the field of highway traffic management and highway traffic safety. Background technique [0002] The speed limit of road vehicles is an important measure to improve the safety of road traffic, ensure the smooth flow of roads and improve the efficiency of road traffic. A reasonable speed limit value should be able to reflect the pros and cons of driving conditions, and meet the driver's expectations as much as possible, and serve the purpose of assisting the driver to choose a vehicle speed that is suitable for the driving conditions; too high a speed limit value will cause vehicle speed dispersion If the speed limit is too large, it ...

AI Technical Summary

Problems solved by technology

The design speed method is simple and easy to implement, but there are few factors to consider, high requirements for subjective experience, and there is a problem of "one size fits all" for all road sections. In this way, the speed limit may be conservative on road sections with good conditions; 85% percentile The speed of the vehicle is based on statistics and considers the situation of most vehicles, but there are two problems. One is that it is assumed that the driver is capable and willing to choose a reasonable speed. In fact, the driver’s misjudgment of the road and traffic conditions, Choosing an unreasonable vehicle speed is an important cause of traffic accidents; second, this method uses traffic data as the basic data, which is powerless for newly-built roads that lack basic data

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