**6.2 Lane departure warning**

Lane departure warning mechanism works on the principles of certain thresholds with respect to distance, time to lane crossing. It is based on the decision made out from the data fusion analysis supported with computer software algorithm to warn the driver that he or she is about commit mistake in departing traffic lane. For example, sensors such as acoustic, optic means continuously generate and analyze the data along with the video image processing data created by the vehicle cameras results in the detection of warning to the vehicle. In order to make the warning system effective, the carriage way would have to be laid with Good visible lane markings system. These influence the complexity of the system on the roadside. This system aims to prevent involuntary lane departure, which constitutes a relevant cause of road accidents. With real-time measurement and positional accuracy which is generally at less than 2 cm, the system captures the data that the sensor performs the task of lane departure action as shown in **Figure 11**. This warns the Lane Departure Warning system if the vehicle suddenly decides to change the lane without proper indication. The camera used for the lane detection system is low cost generally mounted on the windscreen near the rear view. The position of this location of the camera helps continuously capture the image of solid lane line marking of the road towards the front side of driving. it also works along with the front (adaptive cruise control and, ii) forward collision warning), side (lane departure warning), and iii) rear side (blind spot detection).
