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This paper presents a Real Time Monitoring System for Driver Vigilance. The main components of the system consist of a web cam for real-time image acquisition and an alarm system which characterize a Driver's level of vigilance. The three conditions in which the facial expressions of the driver taken are vehicle light, sunlight and noise. The effect of these three conditions is reflected in the behaviour of, for example eyes being open, close or blinking. When the lights of the other vehicles coming from the opposite direction falls on the face of driver then the colour of that part will get changed. The images are segmented into red, white, blue, and yellow colours using YCbCr colour space technique. The effect of noise that is the sound of the other vehicles creates some changes on the upper part of the face. It results in the appearance of the lines on the forehead. In this paper, we will develop a system which will monitor the facial expressions and alert the driver. In this paper, we concentrate only on the vehicle light effects.