2008 Volvo V70 Owner's Manual - Page 149

159 04 Comfort and driving pleasure Adaptive Cruise Control-ACC WARNING Adaptive cruise control is not a collision avoidance system. The driver is always responsible for applying the brakes if the system does not detect another vehicle. Adaptive cruise control does not react to slow moving or stationary vehicles. The distance to the vehicle ahead (in the same lane) is measured by a radar sensor. Your vehicle's speed is regulated by acceleration and braking. The brakes may emit a sound when they are being modulated by the adaptive cruise control system. This is normal. WARNING The brake pedal moves when the adaptive cruise control system modulates the brakes. Do not rest your foot under the brake pedal. The adaptive cruise control system is designed to follow the vehicle ahead of you in the same lane, at a set time interval. If the radar sensor has not detected a vehicle ahead, the system will then attempt to maintain the set speed. This is also the case if the speed of the vehicle ahead exceeds the speed that you have set. The adaptive cruise control system is designed to smoothly regulate speed. However, the driver must apply the brakes in situations that require immediate braking. This applies when there are great differences in speed between vehicles, or if the vehicle ahead brakes suddenly. WARNING Due to limitations in the radar sensor, braking may occur unexpectedly or not at all, see page 162. Adaptive cruise control can only be activated at speeds above 20 mph (30 km/h). If speed falls below 20 mph (30 km/h) or if engine speed (rpm) becomes too low, adaptive cruise control disengages and will no longer modulate the brakes. In situations when adaptive cruise control cannot be activated Cruise Control Unavailable is shown in the display, see page 168. WARNING When adaptive cruise control disengages, the brakes will not be modulated automatically. The driver must assume full control over the vehicle. Warning light-driver braking required Adaptive cruise control has a braking capacity that is equivalent to approximately 30% of the vehicle's total braking capacity. In situations requiring more brake force than ACC can provide, if the driver does not apply the brakes, an audible signal will sound and a red warning light will illuminate in the windshield to alert the driver to react. NOTE