With cruise control engaged and a cruise speed set, you are maintaining a set following distance behind the
vehicle in front of you (The system DOES NOT respond to side-to-side moving traffic or oncoming traffic.).
If the vehicle in front of the coach slows down below your cruise control set speed, the system will
progressively intervene as follows, in this order:
1. Reduce the engine throttle;
2. Apply the engine brake;
3. Apply about 30% of the service brakes available braking power in an attempt to maintain the set following
distance.
The driver must apply additional braking power when required, to avoid collision or to maintain a safe distance
from the vehicle ahead.
NOTE
If the ACB is actively decelerating or braking the coach in an attempt to maintain the set following distance
at the moment when the driver cancels the ACB system, the ACB system will continue deceleration or
braking intervention until a safe following distance is established, then will cancel.
Even though the cruise control doesn’t operate at speeds below 30 mph (50 km/h), the ACB system will
continue deceleration or braking intervention in an attempt to maintain the set following distance if the coach
speed reduces to less than 30 mph (50 km/h).
If the vehicle ahead slows below your cruise control’s set speed, but then accelerates away, and the
ACB system did not need to use the service brakes as it managed the intervention, the coach will
automatically accelerate back to the original cruise control set speed, and again maintain a set following
distance behind the forward vehicle.
NOTE
The maximum radar range is approximately 500 feet (150 meters). Rain, snow, fog, ice and other severe
weather conditions may affect the performance of the ACB system and shorten radar range.
As part of your pre-trip vehicle inspection, check to see that there is no mud, snow, ice build-up or other
obstruction in front of the radar sensor. You should inspect the radar sensor mounting and remove any
obstruction that may impair the sensor functioning.
DRIVER WARNINGS AND SYSTEM STATUS
Before using the ACB, the driver should fully understand all the audible and visual warnings that the system
provides. Any audible warning (beeping or tone) means that your vehicle is too close from the vehicle ahead.
Forward Vehicle Detected
When ACB is turned on and a valid cruise speed is set, if the forward vehicle is detected (in range) by the
radar, the FORWARD VEHICLE DETECTED status pictogram will appear in the DID. This is an indication to
the driver that the forward vehicle is being tracked, that the ACB is actively managing the distance between
the coach and the vehicle ahead and that the ACB system may automatically intervene to maintain the set
following distance.
PA-1652 Operator's Manual H3-45 Coach
Controls and Instruments 4-61
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