Abstract
The relationships among fatigue, hours of service, and safety of operations of truck and bus operators were investigated through (1) a review of research pertaining to driver fatigue and alertness; (2) an opinion survey of professional drivers and officials concerning current practices and regulations related to hours of service; (3) analysis of accident data from the viewpoint of possible fatigue-related causes; and (4) an investigation of the effects of hours on the road, rest breaks type of operation, time of day, and driver age.