Skip to content
Vehicle properties
ADAS & driver assistance

LOW_SPEED_AUTOMATIC_EMERGENCY_BRAKING_ENABLED

What it is

Enable or disable Low Speed Automatic Emergency Braking.

Set true to enable Low Speed Automatic Emergency Braking or false to disable Low Speed Automatic Emergency Braking. When Low Speed Automatic Emergency Braking is enabled, the ADAS system in the vehicle should be turned on and monitoring to avoid potential collisions in low speed conditions. This property is different from the pre-existing AUTOMATIC_EMERGENCY_BRAKING_ENABLED, which should apply to higher speed applications only. If the vehicle doesn't have a separate collision avoidance system for low speed environments, this property should not be implemented.

In general, LOW_SPEED_AUTOMATIC_EMERGENCY_BRAKING_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, that information must be conveyed through the ErrorState values in the LOW_SPEED_AUTOMATIC_EMERGENCY_BRAKING_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 0x11201025 apart:

FieldMaskValueMeans
Group0xf00000000x10000000SYSTEM
Area0x0f0000000x01000000GLOBAL
Type0x00ff00000x00200000BOOLEAN
Ordinal0x0000ffff0x000010250x1025

Reading it from an app

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

boolean value =
        mgr.getBooleanProperty(VehiclePropertyIds.LOW_SPEED_AUTOMATIC_EMERGENCY_BRAKING_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.