Radius of flat curve of road in rainy area and setting method of safe speed limit

Abstract

The invention discloses a method for setting the radius of a road flat curve and a safe speed limit in a rainy area. Considering the influence of rainy weather conditions on environmental visibility and road surface adhesion coefficient, and combining parameters such as the radius of a road flat curve, speed, and transverse slope value, a suitable The calculation model of the radius of the horizontal curve and the safe speed limit of the road in the rainy area includes the following steps: calculating the driving sight distance of the horizontal curve section; calculating the parking sight distance of the horizontal curve section; comparing the relationship between the driving sight distance and the parking sight distance of the horizontal curve section; constructing Calculation model of road level curve radius and speed limit setting; parameter calibration of road level curve radius and speed limit setting calculation model; comparative analysis of existing normative values ​​​​and calculation values ​​​​based on the safe speed limit model based on sight distance; using existing norms The comparison between the value and the calculation value of the safe speed limit model based on the sight distance, the setting of the flat curve radius and the safe speed limit value of the road in rainy areas is of great significance to improve driving safety under rainy 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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