Cadillac 2010 DTS - Manual (Page 187)

If this symbol does not appear, or disappears briefly,
ACC will not respond to vehicles you may see ahead.
{ WARNING:
When the Adaptive Cruise Control radar is blocked
by snow, ice, or dirt, it may not detect a vehicle
ahead. Adaptive Cruise Control may not have time
to slow your vehicle enough to avoid a collision.
Do not use Adaptive Cruise Control when the
radar is blocked by snow, ice, or dirt. Keep your
radar clean. See “Cleaning the System” later in
this section.
ACC automatically slows your vehicle down when
approaching a slower moving vehicle. It then adjusts
your vehicle speed to follow the vehicle in front at
the selected follow distance. Your vehicle speed
increases or decreases to follow the vehicle in front of
you, but will not exceed the set speed. It may apply
limited braking, if necessary. When braking is active,
your brake lights will come on. Braking may feel
or sound different than if you were applying the brakes
yourself. This is normal.
Stationary or Very Slow-Moving Objects
{ WARNING:
Adaptive Cruise Control may not detect and react
to stationary or slow-moving vehicles or other
objects ahead of you. You could crash into an
object ahead of you. Do not use Adaptive Cruise
Control when approaching stationary or
slow-moving vehicles or other objects.
{ WARNING:
Adaptive Cruise Control may not detect and react
to stationary or slow-moving vehicles or other
objects ahead of you. Your vehicle may accelerate
toward objects, such as a stopped vehicle that
suddenly appears after the lead vehicle changes
lanes. Your complete attention is always required
while driving and you should be ready to take
action and apply the brakes.
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