Cadillac 2010 DTS Owner's Manual page 190

Highway Exit Ramps
WARNING:
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Adaptive Cruise Control may lose track of the
vehicle ahead and accelerate up to your set speed
while entering or on highway exit ramps. You
could be startled by this acceleration and even
lose control of the vehicle. Disengage Adaptive
Cruise Control before entering a highway exit
ramp. Do not use Adaptive Cruise Control while
entering or on exit ramps.
Other Vehicle Lane Changes
If another vehicle enters the same lane as you, ACC will
not detect the vehicle until it is completely in the lane.
Be ready to take action and apply the brakes yourself.
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Using ACC on Hills and When Towing a
Trailer
How well ACC will work on hills and when towing a
trailer depends on your vehicle's speed, vehicle load,
traffic conditions and the steepness of the hills. It
may not detect a vehicle in your lane while driving on
hills. When going up steep hills, you may want to
use the accelerator pedal to maintain your vehicle's
speed. When going downhill, especially when towing a
trailer, you may want to brake to keep your speed
down. Applying the brake disengages the system. You
may choose not to use ACC on steep hills, especially
when towing a trailer.
Disengaging ACC
To turn off the system, apply the brake pedal, press the
cancel button, or press the ACC button.