Abstract: The invention concerns a method for assessment of abnormal driving behavior to improve driving safety of a vehicle travelling on a road, using position information and motion information about said vehicle and/or at least one neighboring vehicle travelling in the proximity of said vehicle on said road. The method comprises a step of obtaining and memorizing (40, 42) a plurality of position information items and motion information items, each information item corresponding to a measuring time instant of an observation time interval and a step of obtaining (44) at least one estimate of the reference value for said vehicle and/or its at least one neighboring vehicles travelling on said road during the observation time interval.