RAM 2500 2021 Owner's Manual page 205

NOTE:
If the ACC sensor detects a vehicle ahead,

ACC will apply limited braking or acceleration
(not to exceed the original set speed) auto-
matically to maintain a preset following
distance, while matching the speed of the
vehicle ahead.
Any chassis/suspension or tire size modifica-

tions to the vehicle will affect the perfor-
mance of the Adaptive Cruise Control and
Forward Collision Warning system.
Fixed Speed Cruise Control alone (an ACC

distance not set) will not detect vehicles
directly ahead of you. Always be aware of the
mode selected Ú page 490.
WARNING!
Adaptive Cruise Control (ACC) is a conve-

nience system. It is not a substitute for active
driver involvement. It is always the driver's
responsibility to be attentive of road, traffic,
and weather conditions, vehicle speed,
distance to the vehicle ahead; and, most
importantly, brake operation to ensure safe
operation of the vehicle under all road condi-
tions. Your complete attention is always
required while driving to maintain safe
control of your vehicle. Failure to follow these
warnings can result in a collision and death
or serious personal injury.
The ACC system:

Does not react to pedestrians,

oncoming vehicles, and stationary
objects (e.g., a stopped vehicle in a
traffic jam or a disabled vehicle).
Cannot take street, traffic, and weather

conditions into account, and may be
limited upon adverse sight distance
conditions.
STARTING AND OPERATING
WARNING! (Continued)
Does not always fully recognize

complex driving conditions, which can
result in wrong or missing distance
warnings.
Will bring the vehicle to a complete stop

while following a vehicle ahead and
hold the vehicle for approximately two
seconds in the stop position. At this
point, there will be an "ACC may cancel
soon" chime and warning to the driver.
When ACC is cancelled, the system will
release the brakes and the driver must
take over braking. The system can be
resumed when the vehicle ahead drives
off by releasing the brake and pushing
the resume button on the steering
wheel.
You should switch off the ACC system:
When driving in fog, heavy rain, heavy

snow, sleet, heavy traffic, and complex
driving situations (i.e., in highway construc-
tion zones).
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