The Intensity of the Acceleration and Deceleration of a Passenger Car on a Road Surface Covered with Fresh Snow

The paper presents the results of the experimental studies of the acceleration and deceleration of a car equipped with winter tyres. The road tests were carried out after a snowy day in four stages for the different environmental conditions. The tests were preformed a bituminous pavement covered with fresh snow. A straight piece of the road without the traffic was investigated. Information on the longitudinal inclination of the road surface, i.e. less than 1%, allowed to compensate the effect of the gravitational acceleration on the characteristics of the acceleration and deceleration. The adjustments of the inclination angle allowed to compare the obtained measurement results with the hypothetical characteristics for the structures of the surface layer. The kinematic motion characteristics of the car were recorded with the application of the ADIS 16385 system which consists of three accelerometers and three gyroscopes.