Document ID: chunk:federal_register_of_legislation:F2021C00476:body:0:p49
Version: federal_register_of_legislation:F2021C00476
Segment Type: other
Provision Reference: 
Character Range: 136177–138954

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, 10/ the directly controlled wheels must not lock when the full force 8/ is suddenly applied on the control device at a speed of 50 km/h;

           5.3.5.   Furthermore, laden vehicles equipped with anti-lock systems of category 1 shall, under the conditions of paragraph 5.3.4. of this annex satisfy the prescribed braking rate in Appendix 3 to this annex;

           5.3.6.   However, in the tests provided in paragraphs 5.3.1., 5.3.2., 5.3.3., 5.3.4. and 5.3.5. of this annex, brief periods of wheel-locking shall be 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 must not be affected and the vehicle must not exceed a yaw angle of 15° or deviate from a 3.5 m wide lane;

           5.3.7.   During the tests provided in paragraphs 5.3.4. and 5.3.5. of this annex, steering correction is permitted, if the angular rotation of the steering control 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 must pass over the boundary between the high- and low-adhesion surfaces and during these tests no part of the outer tyres must cross this boundary. 7/

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1/ Anti-lock systems with select-high control are deemed to include both directly and indirectly controlled wheels; in systems with select-low control, all sensed wheels are deemed to be directly controlled wheels.

2/ The manufacturer shall provide the Technical Service with documentation relating to the controller(s) which follows the format set out in Annex 8.

3/ The warning signal may light up again while the vehicle is stationary, provided that it is extinguished before the vehicle speed reaches 10 km/h or 15 km/h, as appropriate, when no defect is present.

4/ Until uniform test procedures have been agreed, the manufacturers shall provide the Technical Services with their test procedures and results.

5/ It is understood that devices changing the control mode of the anti-lock system are not subject to paragraph 4.4. if in the changed control mode condition all requirements to the category of anti-lock systems, with which the vehicle is equipped, are fulfilled.

6/ Until such test surfaces become generally available, tyres at the limit of wear, and higher values up to 0.4 may be used at the discretion of the Technical Service.  The actual value obtained and the type of tyres and surface shall be recorded.

7/ Until a uniform test procedure is