Cadillac 2011 DTS Owner's Manual page 178

If your vehicle speed falls below 32 km/h (20 mph) while
following a vehicle ahead, ACC will begin to disengage.
The Driver Alert symbol will flash and the warning beep
will sound. The driver must take action since ACC will
not slow the vehicle to a stop.
To increase speed to pass a vehicle, use the
accelerator pedal. While you are doing this, the system
will not automatically apply the brakes. A message will
appear on the DIC. See DIC Warnings and Messages
on page 4 62. Once you remove your foot from the
accelerator pedal, ACC will return to normal operation
and be able to apply the brakes, if needed.
If you rest your foot on the accelerator pedal, the
system will not automatically apply the brakes.
You could crash into a vehicle ahead of you. Do
not rest your foot on the accelerator pedal when
using Adaptive Cruise Control.
4-20
Due to Adaptive Cruise Control limitations in
curves, it may respond to a vehicle in another
lane, or may not have time to react to a vehicle in
your lane. You could crash into a vehicle ahead of
you, or lose control of your vehicle. Give extra
attention in curves and be ready to use the brakes
if necessary. Select an appropriate speed while
driving in curves.
ACC may operate differently in a sharp curve. It may
reduce your vehicle speed if the curve is too sharp.