Document ID: chunk:federal_register_of_legislation:F2007C00223:body:0:p9
Version: federal_register_of_legislation:F2007C00223
Segment Type: other
Provision Reference: 
Character Range: 24963–28199

coupling which allows the 'Drawbar' to pivot relative to the dolly chassis about a horizontal axis. The `Tandem Axle Group' supporting such a dolly shall have one of the following (suspension) systems:

           44.2.3.2.13.3.1. a system incorporating at least 4 laminated springs

           44.2.3.2.1.3.3.2. a system incorporating leading and trailing arms; or

           44.2.3.2.13.3.3. a system incorporating torsion bars.

44.2.3.3.                    Mechanical Requirements of 'Road Trains'
44.2.3.3.1.              Maximum gross mass of drawing vehicle
44.2.3.3.1.1.       The maximum gross mass of a drawing vehicle shall be the least of.

          44.2.3.3.1.1.1. the drawing vehicle Manufacturer's 'Gross Combination Mass' rating for the drawing vehicle applicable to long distance haulage in 'Road Train' configuration;

          44.2.3.3.1.1.2. the 'Manufacturer's' 'Gross Combination Mass' rating for any drive line components such as engine, transmission or rear 'Axles' , or

          44.2.3.3.1.1.3.  the maximum 'Gross Combination Mass' at which the vehicle will start from rest on a 5 percent gradient calculated by the formula

           where:

            'GCM' = 'Gross Combination Mass' in kilograms;

           K = Drive efficiency constant for the type of drive 'Axle' fitted to the drawing vehicle

            for single drive `Axles'  K = 0.055

              for single drive tandem 'Axle'  K = 0.053

              for dual drive tandem 'Axles'  K = 0.051

              for tri drive 'Triaxles' K = 0.047

           R = overall gear reduction between engine and drive wheel;

           M = tyre revolutions per kilometre determined from the Table 2 (in this Section) which gives the standard number of revolutions per kilometre to be adopted for tyre sizes used in 'Road Train' operations.

           T = maximum engine net torque in Newton metres; and

             g = maximum grade expressed as a percentage. For normal 'Road Train' operations, a value of 15% (starting ability 10% + operating gradient 5%) is used.

44.2.3.3.1.2.       For 'Road Trains' operating with a 'Gross Combination Mass' up to 38 tonnes, the maximum gross 'Road Train' mass for the drawing vehicle shall be determined in accordance with Clause 44.2.3.3.1.1.1.
44.2.3.3.2.              Maximum road speed capabilities of drawing vehicle
44.2.3.3.2.1.       The maximum road speed capability of a drawing vehicle shall not be in excess of 85km/h.
44.2.3.3.2.2.       The maximum road speed capability shall be calculated by the formula

         Where:

         L = maximum revolutions per minute at which minimum engine power is developed;

         A - overall gear reduction between engine and drive wheels giving highest road speed; and

         M = tyre revolutions per kilometre determined from Table 2 (Clause 44.2.3.3.1.) which gives the standard number of revolutions per kilometre to be adopted for tyre sizes used in `Road Train' operation.

44.2.3.3.3.              Drive `Axle' on drawing vehicle

         The drawing vehicle used in a `Road Train' with a 'Gross Combination Mass' in excess of 42 tonnes shall have at least a tandem driven rear 'Axle Group'.

         If internal differentials