In order to broaden the database of motor vehicle traction properties in unusual conditions, the research team has performed experimental studies: on wet and snow-covered surfaces. Tests of vehicles equipped with winter tyres with non-skid snow chains have been performed on snow-covered surfaces. It has been shown that on a snowy surface chains affect vehicle traction properties, mostly during acceleration. They increase the rate of acceleration up to 50% compared to a vehicle with winter tires without chains. The results of the performed research can be the basis for the full reconstruction of road accidents under these conditions. Knowledge of vehicle traction properties in difficult and unusual conditions is an important factor in improving road safety.