Skip to content
Vehicle properties
ADAS & driver assistance

LANE_DEPARTURE_WARNING_ENABLED

What it is

Enable or disable Lane Departure Warning (LDW).

Set true to enable LDW and false to disable LDW. When LDW is enabled, the ADAS system in the vehicle should be turned on and monitoring if the vehicle is approaching or crossing lane lines, in which case a warning will be given.

In general, LANE_DEPARTURE_WARNING_ENABLED should always return true or false. If the feature is not available due to some temporary state, such as the vehicle speed being too low or too high, that information must be conveyed through the ErrorState values in the LANE_DEPARTURE_WARNING_STATE property.

This property is defined as VehiclePropertyAccess.READ_WRITE, but OEMs have the option to implement it as VehiclePropertyAccess.READ only.

How the ID is built

A property ID is a 32-bit value packing four fields. Reading 0x11201006 apart:

FieldMaskValueMeans
Group0xf00000000x10000000SYSTEM
Area0x0f0000000x01000000GLOBAL
Type0x00ff00000x00200000BOOLEAN
Ordinal0x0000ffff0x000010060x1006

Reading it from an app

CarPropertyManager mgr = (CarPropertyManager)
        car.getCarManager(Car.PROPERTY_SERVICE);

boolean value =
        mgr.getBooleanProperty(VehiclePropertyIds.LANE_DEPARTURE_WARNING_ENABLED, 0);

This property can be read and written, though an OEM may implement it as read-only. It fires a callback whenever the value changes.