Controls and Instruments 4-55
PA-1628Operator's ManualH3-45 COACH
coach and the forward vehicle is less than the set
distance and getting closer. Once the audible
warning is given, the driver must increase the
distance between the coach and the vehicle ahead
until the audible warning stops or maneuver clear of
the forward vehicle.
WARNING
Following Distance Alert is always active
whenever the coach is moving to a speed greater
than 37 mph (60 km/h), whether or not ACB is
turned on. Active interventions of ACB to maintain
safe following distance (throttle reduction, engine
brake application, service brakes application) are
only operational when the ACB is engaged with a
cruise speed set.
IMPACT ALERT
The Impact Alert warning is the most severe warning
issued by the ACB system. This alert indicates that
the driver must take immediate evasive action by
applying more braking power and/or steering clear of
the vehicle ahead to avoid a potential collision.
The Impact Alert is also applicable to stationary
metallic objects, such as stalled vehicles. This alert
provides a warning given up to 3.0 seconds before a
potential collision with a stationary metallic object in
the coach’s lane of travel. The driver can either slow
down or maneuver in an attempt to avoid the object.
The Impact Alert will only warn and will not actively
decelerate or brake the coach when approaching
stationary objects.
WARNING
Impact Alerts are always operational when the
vehicle is running whether or not ACB is turned on.
Active interventions of ACB to maintain safe
following distance (throttle reduction, engine brake
application, service brake application) are only
operational when the ACB is engaged with a cruise
speed set.
BRAKE OVERUSE WARNING
ACB provides a warning when the system is
intervening and using the service brakes
excessively. Overuse of the foundation brakes can
lead to the brakes overheating and a potential loss of
braking performance from brake fade. For example,
the use of ACB on downhill runs may cause this alert
to be activated. It is recommended that ACB be
disengaged on downhill grades. The driver should
use appropriate gearing and brake techniques, and
not rely on ACB, on downhill grades.
If the driver does not respond to the Brake Overuse
Warning after a brief delay, the ACB will switch off.
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