Science and Education Publishing American Journal of Mechanical Engineering 2 7 2014 11 05 Non-typical Hazards in Road Traffic 252 257 EN Marian Dudziak Andrzej Lewandowski Michał Śledziński Poznan University of Technology, Chair of Basics of Machine Design, 60-365 Poznań, ul. Piotrowo 3, Poland AJME20142716 10.12691/ajme-2-7-16 2014 10 03 2014 10 28 2014 11 05 The authors describe a road traffic accident with an unusual cause which was a wrong defensive reaction of the driver on the road surface covered with spilled grain. The results of road tests are presented illustrating behaviour of the vehicle on the road surface in such conditions. Attention is paid to the psychological aspect of the drivers defensive reactions in the situation when they are taken aback with non-typical road surface conditions. There is a need to train drivers in right decision making skills (psychology) and in the ability to make effective defensive manoeuvres (driving technique) in order to improve road traffic safety.