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Division 5.3 Additional checks

United Kingdom

Original text. Later amendments are not shown.

The following additional checks shall be carried out with the engine disconnected, with the vehicle laden and unladen:

  1. 5.3.1.

    The wheels directly controlled by an anti-lock braking system shall not lock when the full force is suddenly applied on the control device, on the road surfaces specified in point 5.2.2, at an initial speed of 40 km/h and at a high initial speed as indicated in the table below:

    ConditionMaximum test speed
    High adhesion surface0,8 vmax ≤ 80 km/h
    Low adhesion surface0,8 vmax ≤ 70 km/h
  2. 5.3.2.

    When an axle passes from a high-adhesion surface (kH) to low-adhesion surface (kL) where kH ≥ 0,5 and kH/kL ≥ 2, with the full force applied on the control device, the directly controlled wheels shall not lock. The running speed and the instant of applying the brakes shall be so calculated that, with the anti-lock braking system fully cycling on the high-adhesion surface, the passage from one surface to the other is made at high and at low speed, under the conditions laid down in point 5.3.1 above.

  3. 5.3.3.

    When a vehicle passes from a low-adhesion surface (kL) to a high-adhesion surface (kH) where kH ≥ 0,5 and kH/kL ≥ 2, with the full force applied on the control device, the deceleration of the vehicle shall rise to the appropriate high value within a reasonable time and the vehicle shall not deviate from its initial course. The running speed and the instant of applying the brakes shall be so calculated that, with the anti-lock braking system fully cycling on the low-adhesion surface, the passage from one surface to the other occurs at approximately 50 km/h or 0,8 vmax, whichever is the lower.

  4. 5.3.4.

    In the case of vehicles equipped with anti-lock braking systems of categories 1 and 2, when the right and left wheels of the vehicle are situated on surfaces with differing coefficients of adhesion (kH and kL) where kH ≥ 0,5 and kH/kL ≥ 2 the directly controlled wheels shall not lock when the full force is suddenly applied on the control device at a speed of 50 km/h or 0,8 vmax, whichever is the lower.

  5. 5.3.5.

    Furthermore, laden vehicles equipped with anti-lock braking systems of category 1 shall, under the conditions of point 5.3.4, satisfy the braking rate prescribed in Appendix 3.

  6. 5.3.6.

    However, in the tests provided for in points 5.3.1, 5.3.2, 5.3.3, 5.3.4 and 5.3.5, brief periods of wheel-locking are allowed. Furthermore, wheel-locking is permitted when the vehicle speed is less than 15 km/h; likewise, locking of indirectly controlled wheels is permitted at any speed, but stability and steerability shall not be affected.

  7. 5.3.7.

    During the tests provided for in points 5.3.4 and 5.3.5, steering correction is permitted if the angular rotation of the steering control device is within 120° during the initial 2 seconds and not more than 240° in all. Furthermore, at the beginning of these tests the longitudinal median plane of the vehicle shall pass over the boundary between the high- and low-adhesion surfaces and during these tests no part of the (outer) tyres shall cross this boundary.

  8. 5.3.8.

    The following notes are taken into account:

    1. 5.3.8.1.

      kH and kL are measured as laid down in Appendix 2 to this Annex.

    2. 5.3.8.2.

      The purpose of the tests in the following points 5.3.1, 5.3.2, 5.3.3 and 5.3.4 is to check that the directly controlled wheels do not lock and that the vehicle remains stable. In these tests a higher force value than the one of the full force may be used if required to activate the anti-lock braking system.

    3. 5.3.8.3.

      With regard to points 5.3.1 and 5.3.2 it is not necessary, therefore, to make complete stops and bring the vehicle to a complete halt on the low-adhesion surface.