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Division 2.2.3.5

United Kingdom

Original text. Later amendments are not shown.

If a towed vehicle has a continuous or semi-continuous braking system where the pressure in the brake actuators does not change during braking despite the dynamic axle load shifting, the towed vehicle alone may be braked. The braking rate zR of the towed vehicle shall be calculated according to the following formula:

z R = z R + M − R × F M + F R F R + R

Where:

R

  • rolling resistance value:

    • 0,02 in the case of vehicles with a maximum design speed not exceeding 40 km/h

    • 0,01 in the case of vehicles with a maximum design speed exceeding 40 km/h

    • FM

  • total normal static reaction of road surface on wheels of tractors

    • FR

  • total normal static reaction of road surface on all wheels of towed vehicle