Drivers with a fatigue condition have always become basic problem for many accidents. Driver supposes required to identify the object in front of the vehicle and need to understand the causes of accidents and trouble in vehicle control. Now a day with the increasing traffic conditions, possibility for accidents is increased in a large space because driver is unable to detect themselves the type of fatigue condition they are suffering while driving. So the reason we are going to develop the system which always monitors driver's to avoid accidents in real time. This paper describes dissimilar methods existing for detecting the crisis of driver vigilance and then with comparison of all also chooses best system out of those accessible. As of comparison with all existing methods we have implemented a device which always monitors driver vigilance in real-time using computer vision system which consist of main components as, Raspberry Pi which is specially designed for hardware platform, video camera, and the alarm system for alerting.