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Driver fatigue also known as driver drowsiness is caused by various factors, which can impair and hinder safe driving, including biological, physical, psychological, and other various factors. Accidents through driver fatigue are observed especially in the case where journeys are long-distance, and sleep-deprivation also plays the role of a prominent determining parameter. There is an extensive number of accidents caused by driver fatigue and these are of major safety concern; hence it is of critical importance to come up with some mechanism that can combat and prevent such road accidents to save precious lives. Thanks to technological advancements we can deploy systems that can detect driver fatigue and drowsiness. In this paper, we would be reviewing the various techniques that can be used to implement a system for the detection of driver fatigue.