2008 Cadillac STS Owner's Manual - Page 181

Approaching and Following a Vehicle The vehicle ahead symbol only appears on the HUD when a vehicle ahead is detected in your path. {CAUTION: When the Adaptive Cruise Control radar is blocked by snow, ice, or dirt, it may not detect a vehicle ahead. Adaptive Cruise Control may not have time to slow your vehicle enough to avoid a collision. Do not use Adaptive Cruise Control when the radar is blocked by snow, ice, or dirt. Keep your radar clean. See "Cleaning the System" later in this section. Adaptive Cruise Control automatically slows your vehicle down when approaching a slower moving vehicle. It then adjusts your speed to follow the vehicle in front at the selected following distance. Your speed increases or decreases to follow the vehicle in front of you but will not exceed the set speed. It may apply limited braking, if necessary. When braking is active, your brake lights come on. It may feel or sound different than if you were applying the brakes yourself. This is normal. If this symbol does not appear, or disappears briefly, Adaptive Cruise Control will not respond to vehicles you may see ahead. 3-27