2008 Cadillac STS Owner's Manual - Page 166

Warning the Driver The alert symbol will flash on the HUD and a warning beep will sound when driver action may be required. Detecting the Vehicle Ahead The vehicle ahead symbol will only appear on the HUD when a vehicle ahead of you is detected in your path. If this symbol does not appear, or disappears briefly, FCA will not respond to vehicles you may see ahead. The symbol may disappear on curves, highway exit ramps, or hills. Also, when another vehicle enters the same lane as you, the FCA system will not detect the vehicle until it is completely in your driving lane. The driver warning is active when: • You are approaching a vehicle too quickly. • You are following a vehicle ahead much too closely. See Defensive Driving on page 4-2 for more information. {CAUTION: When the Adaptive Cruise Control radar is blocked by snow, ice, or dirt, it may not detect a vehicle ahead. FCA may not help you avoid a collision under these conditions. Do not use FCA when the radar is blocked by snow, ice, or dirt. Keep your radar clean. See "Cleaning the System" under Adaptive Cruise Control on page 3-20. 3-12