2006 Cadillac STS Owner's Manual - Page 170

Approaching and Following a Vehicle The vehicle ahead symbol will only appear on the HUD when a vehicle ahead is detected in your path. Adaptive Cruise Control will, automatically, slow your vehicle down when approaching a slower moving vehicle. It will then adjust your speed to follow the vehicle in front at the selected follow distance. Your speed will increase or decrease 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 will 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. Stationary or Very Slow-Moving Objects {CAUTION: {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 may not detect and react to stationary or slow-moving vehicles or other objects ahead of you. You could crash into an object ahead of you. Do not use Adaptive Cruise Control when approaching stationary or slow-moving vehicles or other objects. 3-26