ACCIDENT RISK MODIFIED BY PASSENGERS

Abstract

An extended evaluation of driving exposure and accident data showed that presence or absence of passengers considerably influences accident risk. This especially holds true when in combination with alcohol use and with respect to driver age. To understand the psychological and social processes at work, the factor passenger was introduced in a simulated driving situation. Following a repeated measurement design, 12 subjects had to drive twice under the conditions: alone, with a silent passenger, with a talking passenger, and while talking on the car phone with another person. The Wuerzburg driving simulator is the front seat of a real car with the original steering wheel and all pedals. The subject can manipulate a car icon at the front computer screen with regard to both speed and direction. The computer generates a road on this screen, which subjects must follow with the car icon as quickly and as safely as they can. In addition, they must react (slow down or brake) to obstacles that suddenly appear in front of the car. Presence of passengers was found to have no influence on information input and automatic actions. However, clear negative effect occurred in driving situations requiring controlled actions. These effects were discussed with respect to young drivers and alcohol. (a) For the record of the covering entry of this conference, please see IRRD abstract no 868581.