Black plate (8,1)Cadillac STS Owner Manual - 2011Warning the DriverThe alert symbol willflash on the HUD and awarning beep will soundwhen driver action may berequired.The driver warning is active when:. You are approaching a vehicle too quickly.. You are following a vehicle ahead much tooclosely.See Defensive Driving on page 5‑2 for moreinformation.Detecting the Vehicle AheadThe vehicle ahead symbol will only appear on the HUDwhen 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 exitramps, or hills. Also, when another vehicle enters thesame lane as you, the FCA system will not detect thevehicle until it is completely in your driving lane.{ WARNING:When the Adaptive Cruise Control radar isblocked by snow, ice, or dirt, it may not detect avehicle ahead. FCA may not help you avoid acollision under these conditions. Do not use FCAwhen the radar is blocked by snow, ice, or dirt.Keep your radar clean. See “Cleaning theSystem” under Adaptive Cruise Control onpage 4‑15.{ WARNING:FCA may not detect and warn soon enough tostationary or slow-moving vehicles or otherobjects ahead of you. You could crash into anobject ahead of you. Do not rely on FCA whenapproaching stationary or slow-moving vehicles orother objects.4-8