Do reduced speed limits increase fatigue related crashes?
There is no evidence that reducing the speed limit increases fatigue related crashes. In fact travelling at higher speeds requires more concentration which induces fatigue. It can be shown that the chance of a fatigue related crash is greater in 110 km/h speed limited roads than 100 km/h roads. Regardless of the behavioural factors causing the crash (speed, fatigue, alcohol) speed adds to the severity of the crash.