Abstract
Road and weather conditions have a significant impact on the occurrence of road accidents and their development as events. According to these circumstances, the system “Driver – Car – Road – Environment” identifies certain types of expertise that are engaged in determining the presence and magnitude of the parameters of the road environment that affect the development of the road transport situation. When conducting relevant investigations, the experts calculate the speed and length of the stopping distance of the vehicle, using coefficients that determine the impact of road conditions on the road traffic situation under study. One of these important indicators is the coefficient of adhesion of car tires to the road surface. Due to the lack of technical capability to experimentally determine the coefficient of adhesion at the place of an accident, many experts are forced to use values from the reference literature. This study is devoted to checking the agreement of reference values of this indicator with actual values that correspond to the conditions of driving on Russian roads. To solve this problem, full-scale measurements were made of the coefficient of adhesion of tires with a coating on more than 2000 km of roads in different regions of Russia (with different climatic and topographic conditions) and the results of field research were analyzed.
Highlights
Road accidents involving overturning vehicles have more serious consequences than other types of road accidents
Overturning the car can be caused by various reasons, in particular, related to road conditions, for example: driving a vehicle with skidding on a road surface with a high coefficient of adhesion or with a viscous loose soil into which the wheels crash when they move laterally; a sharp turn of the vehicle with a radius that does not correspond to the selected speed under the conditions of stability against overturning on roads with a high value of the coefficient of adhesion
The coefficient of adhesion is the ratio of the maximum tangential force acting along the road on the contact area of the interlocked wheel with the road surface to the normal reaction in the contact area of the wheel with the surface [1,2,3]
Summary
Road accidents involving overturning vehicles have more serious consequences than other types of road accidents. Overturning the car can be caused by various reasons, in particular, related to road conditions, for example: driving a vehicle with skidding on a road surface with a high coefficient of adhesion or with a viscous loose soil into which the wheels crash when they move laterally; a sharp turn of the vehicle with a radius that does not correspond to the selected speed under the conditions of stability against overturning on roads with a high value of the coefficient of adhesion (or the coefficient of resistance to the movement of the wheels in the transverse direction on an uneven solid surface) In this case, overturning is possible without skidding. The coefficient of adhesion is the ratio of the maximum tangential force acting along the road on the contact area of the interlocked wheel with the road surface to the normal reaction in the contact area of the wheel with the surface [1,2,3].
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