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This paper contains part of the results of a repetitive and comprehensive analysis of accidents among bus drivers. In a series of articles different aspects of the aetiology of bus drivers' accidents will be highlighted. The results presented indicate a strong negative association of experience with accident risk, modified to a certain extent by age. The suggested interaction between accident liability, age and experience warranted more detailed attention to the first few years of employment, revealing systematic differences between groups of drivers of different age groups but with comparable experience: younger drivers had higher accident rates than older ones. An increase of accident risk during the second year of employment after an initial decline could be detected in the younger group of drivers; the older group only showed a continuous decline.

This paper presents a portion of the results of a comprehensive analysis of the etiology of bus driver accidents. This portion of the analysis concentrates on two questions. First, does the sequence of various shifts influence accident risk on a given day? Various analyses led us to conclude that there was no interaction between the type of shift (either stand-by shift or day off) on preceding days, the actual shift, and the bus drivers' accident risk. This leads to the supposition that the actual situation on the working day is an important factor in determining accident risk. Second, is there any interaction between accident risk and the duration of total (added) rest periods during the shift up to the moment of the accident? No such association could be detected. Our analysis and conclusions are restricted to possible effects of total resting time and cannot be extended to possible effects on accident risk of particular rest periods of different duration and at a different stage within a shift.

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