Abstract
The aim of this study is to examine the 'extra motives' assumed by the theory of zero risk (Naeaetaenen, R. & Summala, H., Road-user behavior and traffic accidents, Amsterdam, North-Holland, 1976) for drivers who frequently drive during their working hours. Sales and marketing people and construction workers were selected as subjects of a questionnaire study. Time pressure, tiredness, thinking about work while driving, and use of mobile telephone were shown to be risk factors in driving during working hours. The results confirmed the zero risk theory as there are some extra motives in driving at work which disturb the drivers' concentration in traffic. (Author/publisher).