If the driven speed and the target speed differ, the wheels may lose traction.
Observe the notes on driving systems and your responsibility; you may otherwise fail to recognise dangers More.
You are always responsible for keeping control of the vehicle and for assessing whether the downhill gradient can be negotiated. Depending on road surface and tyres, DSR may not always be able to keep to the target speed. Select a target speed suitable for the environmental conditions and also apply the brakes yourself if required.