Cadillac 2007 DTS - Manual (Page 183)

When following a vehicle and entering a curve,
Adaptive Cruise Control could lose track of
the vehicle in your lane and accelerate your
vehicle. When this happens the Vehicle Ahead
symbol will not appear. Adaptive Cruise Control may detect a vehicle that
is not in your lane and apply the brakes.
Adaptive Cruise Control may, occasionally,
provide a driver alert and/or braking that you
consider unnecessary. It could respond to signs,
guardrails, and other stationary objects when
entering or exiting a curve. This is normal
operation. Your vehicle does not need service.
183