Volvo 2008 V70 Owner's Manual page 164

The function is activated when the vehicle exceeds a speed of 40 mph (65 km/h). The display will show level markings
of 1-5 bars, where a low number of bars indicates erratic driving. A high number of bars indicates stable driving.
If the vehicle is being driven erratically, the driver will be alerted by an audible signal and the message
Time for a break is displayed. The warning will be repeated after a short time if the driving pattern remains the same.
WARNING
An alert should be taken seriously since it is sometimes difficult for a driver to realize that he/she is fatigued.
In the event of a warning or if the driver feels fatigued, stop as soon as possible in a safe place and rest.
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04 Comfort and driving pleasure
Driver Alert System-option
Symbols and messages in the display
176
04 Comfort and driving pleasure
Driver Alert System-option
Lane Departure Warning (LDW)-general information
Driver Alert,