See also:

Queue Assist
The following functions are linked to your vehicle's automatic transmission and comprise the Queue Assist feature. Please note that the lowest speed that can be set is 18 mph (30 km/h), althoug ...

Changing the set speed
After a speed has been set, it can be increased or decreased by using the or buttons. Each time one of these buttons is pressed, the vehicle's speed changes by 5 mph (approximately 8 km/h). ...

Accessory installation
We strongly recommend that Volvo owners install only genuine, Volvo-approved accessories, and that accessory installations be performed only by a trained and qualified Volvo service technicia ...