| The directly controlled wheels shall not lock when the full force8 is suddenly applied on the control device of the towing vehicle at a speed of 50 km/h. The ratio zRALH/zRALL may be ascertained by the procedure in paragraph 2 of Appendix 2 of this annex or by calculating the ratio zRALH/zRALL. Under this condition the unladen vehicle shall satisfy the prescribed braking rate in Appendix 3 to this annex.13 | a0c0 |