2007 Volvo S80 Owner's Manual - Page 148

Visual warning signal, collision risk Sensor The radar sensor detects vehicles ahead that are moving in the same direction as your vehicle. In the event of a collision risk, you will be alerted by a red warning light and an audible warning signal. If the risk of collision increases after the warning, brake support is activated. The brake support prepares the brake system for rapid braking and the brakes are applied gently, which may be noticeable. If the brake pedal is depressed quickly then braking is implemented with full brake function, even if the force on the pedal is light. 151 04 Comfort and driving pleasure Collision warning system (option) The collision warning system is active at speeds above approximately 5 mph (7 km/h). Limitations The visual warning signal may be difficult to see in strong sunlight or when sunglasses are being worn. For this reason always activate the audible warning signal in such conditions. NOTE The visual warning signal may be temporarily disengaged in the event of high passenger compartment temperature due to strong sunlight, etc. If this occurs, the audible warning signal will be used, even if it has been deactivated in the menu system. Warnings may not appear if the distance to the vehicle ahead is very small or if steering wheel and pedal movements are large, for example, due to a very active driving style. The collision warning system uses the same radar sensors as adaptive cruise control. For more information on the radar sensor and its limitations, see page 146. WARNING In certain situations, the system cannot provide warnings, the warning may be delayed, or false warnings may be given if traffic conditions make it impossible for the radar sensor to detect the vehicle ahead. If no warning is given, no brake support is provided.