2010 Volvo XC60 Owner's Manual - Page 183

04 Comfort and driving pleasure Driver Alert System* Introduction The Driver Alert System is designed to help a driver who may be becoming fatigued or who is inadvertently leaving the lane. The Driver Alert System consists of two different functions that can be switched on together or separately. Driver Alert Control (DAC)-general information DAC is designed to help detect a slowly changing driving pattern. It is primarily intended to be used on main roads and is not meant for use in city traffic. WARNING • • G017332 • Driver Alert Control (DAC) • Lane Departure Warning (LDW) When one or both of the functions has been switched on, it is in standby mode and is activated when the vehicle exceeds a speed of 40 mph (65 km/h). The function deactivates if speed goes under 37 mph (60 km/h). Both functions use a camera that is dependent on the road/lane being clearly marked by painted lines on each side. DAC is not intended to extend the duration of driving. Always plan breaks at regular intervals to help remain alert. In certain cases, fatigue may not affect the driver's behavior. In situations of this type, no warning will be provided. Therefore, it is important to take breaks at regular intervals, regardless of whether or not DAC has given a warning. 04 This function is intended to alert the driver if his/her driving becomes erratic, such as if the driver is distracted or fatigued. Limitations NOTE The camera has certain limitations, see page 163. WARNING The Driver Alert system does not function in all situations and is designed to be a supplementary aid. It is not, however, intended to replace the driver's attention and judgement. In certain situations, DAC may provide warnings even if the driver's driving pattern has not become erratic. A camera monitors the painted lines marking the lane in which the vehicle is traveling and compares the direction of the road with the driver's movements of the steering wheel. The driver is alerted if the vehicle does not follow the lane smoothly. • if the driver is testing the LDW function • in strong crosswinds • on grooved road surfaces. `` * Option/accessory, for more information, see Introduction. 183