  Driver fatigue is one of the important factors that cause traffic accidents,
and the ever-increasing number due to diminished drivers vigilance level has
become a problem of serious concern to society. Drivers with a diminished
vigilance level suffer from a marked decline in their abilities of perception,
recognition, and vehicle control, and therefore pose serious danger to their
own life and the lives of other people. Exhaustion resulting from sleep
deprivation or sleep disorders is an important factor in the creasing number of
accidents. In this projected work, we discuss the various methods of the
existing and the proposed method based on a real time online safety prototype
that controls the vehicle speed under driver fatigue. The purpose of such a
model is to advance a system to detect fatigue symptoms in drivers and control
the speed of vehicle to avoid accidents. This system was tested adequately with
subjects of different technology of various researchers finally the validity of
the proposed model for vehicle speed controller based on driver fatigue
detection is shown.
