2008 Volvo S80 Owner's Manual - Page 168

This function is intended to alert the driver if his/her driving becomes erratic, such as if the driver is distracted or fatigued. 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. NOTE The camera has certain limitations, see page 168. 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 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 Limitations In certain situations, DAC may provide warnings even if the driver's driving pattern has not become erratic. if the driver is testing the LDW function in strong crosswinds on grooved road surfaces. 172 04 Comfort and driving pleasure Driver Alert System-option Operating DAC Certain settings can be made from the menu system controlled from the center instrument panel. See page 122 for more information on the menu system. The current system status can be checked on the trip computer's display by using the buttons on the left steering wheel lever.