How Can Lane Departure Warning Prevent Accidents?

lane departure warning

Lane Departure Warning System Working Explained:

Lane Departure Warning is a Driver Assistance System or an active safety system. It alerts the driver if the vehicle tends to depart the lane unintentionally. Thus, this system keeps track of the lane markings on the road.

Continuous driving for long hours may lead to the loss of driver concentration and driver drowsiness. In such a case, the vehicle may drift from its lane. Thus, it increases the chances of collision with the vehicle in the adjacent lane. This motion, being totally unintentional, could have been avoided if the driver had been alerted at that particular moment. Therefore, it is the sole purpose of developing this system.

Working of Lane Departure Warning:

Components of LDW
Components of Lane Departure Warning (Courtesy: Nissan Motor Corporation)

This system works with the help of a camera. The camera positions itself on the vehicle’s windscreen at the height of the rearview mirror. It continuously monitors the lane markings on the road ahead. The system then determines the vehicle’s position with respect to the lane. Next, it looks for whether the vehicle is crossing the lanes unintentionally. Then, the system warns the driver immediately in the form of an audio-visual signal via the digital dashboard and steering wheel shake. This indication alerts the driver again so that they can countersteer. Thus, the driver can avoid any unwanted consequences of the lane change.

working of LDW
Working of Lane Departure Warning (Courtesy: Mazda)

Furthermore, the system on a BMW vehicle can detect the lane markings up to a distance of 50m ahead of the vehicle. The system activates automatically after the vehicle attains a speed of 70kmph. Some of the systems allow the driver to set the activation speed of their choice.

In addition, the system does not issue the Lane Departure Warning if the maneuver is intentional. Instead, it includes actions such as the one accompanied by switching on the side indicator.


However, some manufacturers claim that the system may not function properly on the road with curves or bends or poor visibility.

Watch the Lane Departure Warning System in Action:

Read More: How does Emergency Signal Assist work in cars?>>

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