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• Approach Angle -✓✓the angle between the plane of the carrier bed or platform and the
ground.
• Auxiliary Braking Device -✓✓a device which attaches to the disabled vehicle to assist
the tow truck's brakes in retarding or stopping both vehicles.
• Auxiliary Equipment -✓✓equipment that is not necessary to perform the basic function
of the primary equipment.
• Auxiliary Tow Lights -✓✓stop, tail and turn signal lights attached to the trailing end of
the towed vehicle, and operated as part of the towing vehicle's lighting system. Also see
"Drag Lights".
• Auxiliary Winch -✓✓same as "Drag Winch": a winch whose cable goes directly to the
load, and not over the end of the boom.
• Axle Covers -✓✓devices used to cover drive axle shaft openings to help prevent
contamination or loss of wheel bearing lubrication during towing or transporting
operations.
• Bed Locks -✓✓devices on a vehicle with a movable bed that secure the bed in place
while traveling.
• Boom -✓✓a structural member, extending from a mast, that supports the load and is
used to hold, extend or lift a load free of the ground and clear of the tow truck body.
• Breaking Strength Rating -✓✓the maximum weight or load, as established by the
manufacturer, that new, unused equipment can bear, under ideal laboratory conditions,
without being damaged.
• Bridle -✓✓a V or Y type coupling device used to attach and center a cable in recovery,
loading and unloading operations.
• Cab -✓✓the driver/passenger-carrying compartment of a truck
• Cab-to-Axle (CA) -✓✓the distance from the back of the truck cab to the center of the
rear axle. See chassis manufacturer's dimensions.
, • Cable -✓✓steel wire rope used for pulling or supporting a load.
• Car Carrier -✓✓a vehicle equipped to transport one to three motor vehicles on a flat
platform that slides or tilts to the ground to facilitate the loading and unloading of these
vehicles; may or may not have an additional assembly attached to the rear to facilitate
towing an additional vehicle. These units are also known as slidebacks, rollbacks,
transporting equipment carriers and flatbeds.
• Chain Grade or Strength Rating -✓✓the number placed on chain by the manufacturer
as part of the National Association of Chain Manufacturers' system of identifying chain.
Chain manufactured by NACM standards also bears a letter that identifies the
manufacturer.
• Cross-Member -✓✓a general term applied to transverse members in the
understructure of a vehicle.
• Curb Weight -✓✓the unloaded weight of a truck, axle or axle combination.
• Disabled Vehicle -✓✓for purposes of this manual, this term refers to a motor vehicle
that is illegally parked, abandoned, or disabled (unable to operate under its own power),
or a motor vehicle that has been involved in an accident.
• Dolly -✓✓A four-wheel carriage used, in towing, to support the trailing end of a towed
vehicle.
• Drag Lights -✓✓same as "Auxiliary Tow Lights": stop, tail and turn signal lights
attached to the trailing end of the towed vehicle, and operated as part of the towing
vehicle's lighting system.
• Drag Winch -✓✓a winch whose cable goes directly to the load, and not over the end of
the boom. Also see "Auxiliary Winch".
• Driveline -✓✓a vehicle's drive shaft and associated joints.
• Fascia -✓✓flexible material commonly used as a bumper cover (may extend below the
bumper).
• Forks -✓✓devices attached to the lift bar (also see "Tow Bar") for lifting a vehicle by
the axle, frame or structural member. May be classified as chain, axle or frame forks.
• Front Axle Weight (FAW) -✓✓the curb weight (unloaded weight) of the front axle or
front axle combination.