Road horizontal curve radius and safe speed limitation setting method of rainy areas

Abstract

The invention discloses a road horizontal curve radius and safe speed limitation setting method of rainy areas. A calculation model suitable for road horizontal curve radius and safe speed limitationin rainy areas is constructed by taking influences of rainy day conditions on environmental visibility and tire-road friction coefficient into consideration and combining parameters of the road horizontal curve radius, velocity, cross slope values and the like. The method comprises the steps that sight distance in a horizontal curve road section is calculated; stopping sight distance in the horizontal curve road section is calculated; relationship comparison between the sight distance in the horizontal curve road section and the stopping sight distance in the horizontal curve road section is conducted; a road horizontal curve radius and safe speed limitation setting calculation model is constructed; parameter calibration is conducted on the road horizontal curve radius and safe speed limitation setting calculation model; comparison analysis is conducted between existing standard values and safe speed limitation model calculation values based on the sight distance; result comparison isconducted by using the existing standard values and the safe speed limitation model calculation values, the road horizontal curve radius and safe speed limitation values in the rainy areas are set, and the method has significant meaning in improving driving safety under rainy day conditions.

Description

technical field [0001] The invention relates to the field of setting methods for road flat curve radius and safety speed limit, in particular to a method for setting road flat curve radius and safety speed limit in rainy areas. Background technique [0002] my country's road design regulations clearly stipulate that in the planar alignment design of roads, no matter the size of the corner, a flat curve should be set. Horizontal curves are an important part of road alignment. Compared with straight road sections, they have better terrain adaptability, followability, aesthetics, and ease of design and survey. Therefore, horizontal curves are widely used. However, the number of traffic accidents on the level curve section of the road accounts for a higher proportion of the total number of accidents. Statistics show that the fatality rate of accidents on the level curve section of the road accounts for 16.6% of the total accident death rate, and the weather with low visibility s...

AI Technical Summary

Problems solved by technology

The invention patent with the application number 201610301312.5 proposes a dynamic speed limit method for expressways, which uses the weather condition detection module to detect abnormal weather, and obtains the limit for the corresponding road section based on real-time data (including traffic condition data, visibility, road surface friction coefficient, and wind speed and direction). speed value; but the speed limit value of this method does not take into account the impact of the flat curve on the driver's driving sight distance

The invention patent with the application number 201611127681.3 proposes an optimization method for the safety design of the road horizontal curve radius based on the vehicle rollover and sideslip virtual test, builds the driver-vehicle-target road section virtual test simulation platform, and calculates the lateral acceleration ratio and load transfer rate value to determine the flat curve radius with the minimum target value function; but this method does not consider the influence of weather factors on the parking sight distance, and it is difficult to accurately set the optimal radius value of the flat curve only by using a single vehicle dynamics performance index

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