Fatigue is acknowledged by road safety professionals as a substantial contributor to car and truck crashes. However, little is currently known about the contribution of fatigue to motorcycle crashes or if qualitative differences exist between rider fatigue and driver fatigue. This paper discusses how key factors such as temporal patterns of riding, trip purpose, environmental influences, the physical demands of riding, and the cognitive demands of riding differ from driving and their potential role as contributing factors for rider fatigue. A new conceptual Motorcycling Fatigue Model is presented as an adaptation of the Fatigue Expert Group model for fatigue in heavy vehicle drivers. The new model is an endeavour to integrate all motorcycle specific fatigue factors in addition to the known factors that contribute to fatigue in all road users (e.g. inadequate sleep) to synthesise our current understanding of fatigue in motorcycling and provide a framework for future research.
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