Dodge Durango 2012 Owner's Manual page 225

Turns And Bends
When driving on a curve with ACC engaged, the system
may decrease the vehicle speed and acceleration for
convenience reasons, with no target vehicle detected.
Once the vehicle is out of the curve the system will
resume your original Set Speed. This is a part of normal
ACC system functionality.
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 223
ACC may occasionally provide braking and/or a driver
alert that you consider unnecessary. This may be the
systems response to signs, guardrails, and other station-
ary objects in a curve. This may also occur at the base of
steep hills. This is normal operation and your vehicle
does not require service.
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