Document ID: chunk:federal_register_of_legislation:F2021C01192:body:0:p60
Version: federal_register_of_legislation:F2021C01192
Segment Type: other
Provision Reference: 
Character Range: 158394–159919

of this annex if in the changed control mode condition all requirements to the category of anti-lock systems, with which the vehicle is equipped, are fulfilled.
 [19] 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.
 [20] 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.
 [21] "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.
 [22] 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.
 [23] 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.
 [24] FMnd and FMd in case of two-axled motor vehicles:  these symbols may be simplified to corresponding Fi - symbols.
 [25] Until such test surfaces become generally available, a ratio R up to 2.5 is acceptable, subject to discussion with the Technical Service.