Lane Departure Warning Systems Explained
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Lane Departure Warning Systems Explained

Lane Departure Featured Image


According to research in the U.S., single-vehicle crashes in which vehicles left the roadway accounted for 40% of fatal crashes and 21% of non-fatal injury crashes in 2014. Also 28.9% of all accidents were side-impact related accidents.

That's a significant issue, especially in the instances where large commercial vehicles are involved, which have the potential to cause more damage.


Just over half of these crashes (53%) don't involve any kind of physical issue, such as fatigue or illness, and are simply down to distraction, poor driving, etc.

Given these stats, it becomes clear that a system that can warn the driver if they unintentionally exit their lane, could significantly reduce accident rates and save lives.



One of the many features of ADAS (Advanced Driver Assistance System) is specifically LDW (Lane Departure Warning).

The system monitors the road ahead and gives a warning if the vehicle exits the lane without the indicators being active.

But how does it specifically work?



The first element of the LDW system is the forward-facing camera. This is a specialised camera that attaches to a specific point on the windscreen. Its shape is very important as it is calibrated to the width of lane on a major road. Further fine-tune calibration is done during the installation process to give the most accurate results.


The main processing unit scans the video feed and maps out the lane ahead. This is not normally seen by the driver, but the second image just below shows an example of what the processing unit is doing.


The ProVision ADAS System connects to the vehicle's on-board systems to detect the use of the indicators. This is critical as a warning is only given if the indicators are not active when the lane departure occurs.


If the indicators are not active, the system issues an audible warning to the driver, who can then refocus on the road ahead and therefore avoid the accident.

However, if installed in conjunction with the ProVision Vehicle Camera system, the Lane Deviation is also registered in sync with the camera footage and an alert is sent to the fleet manager. This allows him/her to monitor drivers' performance in real-time and take appropriate action, which may include training or similar actions.

 So, say goodbye to driver-fault related accidents...

If you want to see these types of accidents become a thing of the past in your fleet, check out our ProVision ADAS page or get in contact and we can give you more information!