Problem of the selection of the rate of the grip of tyres to the roadway covered with petroleum-derived substances

The area of the roadway covered with petroleum-derived substance is characterized by lowering the grip of tyres of the vehicle to the roadway. In realistic conditions of the road traffic that kind of obstacles are with difficulty noticeable for the driver and sedatenesses constitute the element of surprise which in combination with violent lowering the rate of the adhesion usually results in loss directional of vehicle. The vehicle which fell into the unchecked skid, in particular on the curve of the road is posing a threat to drivers driving up from the opposite direction on account of random migration of such a vehicle to their traffic lane. Driving vehicles on the roadway this way polluted also have limited possibilities of taking defensive action in order to avoid confronting. For the evaluation of the bearing of drivers in understanding violating by them safety rules in the road traffic on the roadway polluted with vehicles with substances mentioned above applying the rate of the adhesion which is appropriate in calculations and simulations is significant to the analysed road situation. In the article so a problem of the selection of this rate was taken relating to the case study of an existing road accident consisting in inducing collision of two vehicles moving along an asphalt wet roadway polluted with petroleum-derived substance - with diesel.