Document ID: chunk:federal_register_of_legislation:F2024C01065:body:0:p5
Version: federal_register_of_legislation:F2024C01065
Segment Type: other
Provision Reference: 
Character Range: 10930–13602

a proportion of the acceleration due to gravity.

   AXIS OF REFERENCE (or "reference axis") - the characteristic axis of the lamp signal determined by the manufacturer of the lamp for use as the direction of reference (H = 0o, V = 0o) for angles of field for photometric measurements and for installing the lamp on the vehicle.

   AXLE - one or more shafts positioned in a line across a vehicle, on which one or more wheels intended to support the vehicle turn.

   AXLE GROUP – means:

         1.                 for a motor vehicle, a 'Single Axle', a 'Tandem Axle Group', a 'Triaxle Group', a 'Close Coupled Axle Group', or a 'Twin Steer Axle Group'; and
         2.                for a trailer, a 'Single Axle', a 'Tandem Axle Group', a 'Triaxle Group', or a 'Close Coupled Axle Group'.

   AXLE LOAD - total load transmitted to the road by all the tyres of all the wheels whose centres may be included between 2 transverse parallel vertical planes less than one metre apart.

   BALL COUPLING - a 'Coupling' comprising a ball and complementary body which clamps only on the outer surface of the ball.

   B-DOUBLE - a combination of vehicles consisting of a prime mover towing 2 'Semi-trailers'.

   BEAD - that part of the tyre usually made of steel wires, wrapped or reinforced by 'Ply Cords', that is shaped to fit the 'Rim'.

   BEAD SEPARATION - a breakdown of bond between components in the 'Bead' area.

   BELT - a layer or layers of 'Cord' or other reinforcement under the 'Tread' to stiffen the tyre structure.

   BELT SEPARATION - a parting of rubber compound between 'Belt' layers or between 'Belts' and 'Plies'.

   BIAS-BELTED TYRE - a 'Pneumatic Tyre' in which the 'Cords' in the tyre 'Carcass' are laid at alternate angles which are substantially less than 90 degrees to the centreline of the 'Tread'.  In addition 'Cord' reinforcing strips are incorporated into the tyre under the 'Tread' such that these 'Cords' make an included angle with the tyre centreline not greater than the same angle made by the 'Carcass' 'Cords'.

   BONNETED CAB - A vehicle cab where no more than half of the engine length is rearward of the foremost point of the windshield base, and/or the centre of the steering wheel is not in the forward quarter of the vehicle's 'Total Length.'

   BRAKE DEVICE- one element of the 'Brake System' that may consist of more than one part but which is designed to perform one or more discrete functions.

   BRAKE POWER ASSIST UNIT - a device installed in a 'Hydraulic Brake System' that reduces the operator effort required to actuate the system and that if inoperative does not prevent the operator from braking the vehicle by a