Volvo Cars’ researchers estimate that the Lane Departure Warning (LDW) system can help to prevent 30 to 40 per cent of accidents caused by single car road departures and head-on collisions.
 
LDW uses the camera located between the windscreen and the rear view mirror and monitors the car’s position between the road markings. The system is activated via a button on the centre console and gives a gentle warning sound if the car crosses one of the road markings without reason such as if the indicator hasn’t been used.

Both the Driver Alert Control and Lane Departure Warning are activated when the car reaches 65km/hr (40mph) and they will stay active as long as the speed exceeds 60km/hr (37mph). The availability of these systems depends on the number and quality of visible road markings. The lane markings must be clearly visible and poor light, fog, snow and extreme weather conditions can make the system unavailable.

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