Document ID: chunk:federal_register_of_legislation:F2021C00477:body:0:p83
Version: federal_register_of_legislation:F2021C00477
Segment Type: other
Provision Reference: 
Character Range: 217013–219878

performances are obtained which are higher than those prescribed in Annex 3, the provisions relating to the adhesion utilization curves shall be applied within the areas of diagram 1 of this annex defined by the straight lines k = 0.8 and z = 0.8.
         [19]  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.
        [20]  The manufacturer shall provide the Technical Service with documentation relating to the controller(s) which follows the format set out in Annex 8.
        [21]  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.
        [22]  Until uniform test procedures have been agreed, the manufacturers shall provide the Technical Services with their test procedures and results.
         [23]  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.
        [24]  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.
         [25]  Until a uniform test procedure is established, the tests required by this paragraph may have to be repeated for vehicles equipped with electrical regenerative braking systems, in order to determine the effect of different braking distribution values provided by automatic functions on the vehicle.
         [26]  "Full force" means the maximum force laid down in Annex 3 to this Regulation; a higher force may be used if required to activate the anti-lock system.
         [27]  The purpose of these tests is to check that the wheels do not lock and that the vehicle remains stable; it is not necessary, therefore, to make complete stops and bring the vehicle to a halt on the low-adhesion surface.
         [28]  kH is the high-adhesion surface coefficient
          kL is the low-adhesion surface coefficient
          kH and kL are measured as laid down in Appendix 2 to this annex.
         [29]  FMnd and FMd in case of two-axled motor vehicles:  these symbols may be simplified to corresponding Fi - symbols.
         [30]  Until such test surfaces become generally available, a ratio R up to 2.5 is acceptable, subject to discussion with the Technical Service.
         [31]  An axle group shall be treated as a single axle and dual wheels shall be treated as a single wheel.

        [32]  The text in