Document ID: chunk:federal_register_of_legislation:F2021C00476:body:0:p30
Version: federal_register_of_legislation:F2021C00476
Segment Type: other
Provision Reference: 
Character Range: 84494–87354

of ± 1 per cent at the prescribed speed for the test.  The dm may be determined by other methods than the measurement of speed and distance; in this case, the accuracy of the dm shall be within ± 3 per cent.

         1.2.  For the approval of any vehicle, the braking performance shall be measured during road tests conducted in the following conditions:

         1.2.1.  The vehicle's condition as regards mass must be as prescribed for each type of test and be specified in the test report;

         1.2.2.  The test must be carried out at the speeds prescribed for each type of test; if the maximum design speed of a vehicle is lower than the speed prescribed for a test, the test shall be performed at the vehicle's maximum speed;

         1.2.3.  During the tests, the force applied to the brake control in order to obtain the prescribed performance must not exceed the maximum force laid down;

         1.2.4.  The road must have a surface affording good adhesion, unless specified otherwise in the relevant annexes;

         1.2.5.  The tests must be performed when there is no wind liable to affect the results;

         1.2.6.  At the start of the tests, the tyres must be cold and at the pressure prescribed for the load actually borne by the wheels when the vehicle is stationary;

         1.2.7.  The prescribed performance must be obtained without locking of the wheels at speeds exceeding 15 km/h, without deviation of the vehicle from a 3.5 m wide lane, without exceeding a yaw angle of 15° and without abnormal vibrations;

         1.2.8.  For vehicles powered completely or partially by an electric motor (or motors), permanently connected to the wheels, all tests must be carried out with these motor(s) connected;

         1.2.9.  For vehicles as described in paragraph 1.2.8. above, fitted with an electric regenerative braking system of category A, behaviour tests defined in paragraph 1.4.3.1. of this annex shall be carried out on a track with a low adhesion coefficient (as defined in paragraph 5.2.2. of Annex 6);

         1.2.9.1. Moreover, for vehicles fitted with an electric regenerative braking system of category A, transient conditions as gear changes or accelerator control release must not affect the behaviour of the vehicle in condition described in paragraph 1.2.9.;

         1.2.10.  In the tests provided in paragraphs 1.2.9. and 1.2.9.1. wheel locking is not allowed.  However, 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;

         1.2.11. For a vehicle with electrically actuated service brakes powered from traction batteries (or an auxiliary battery) which receive(s) energy only from an independent external charging system, these batteries shall, during braking performance testing, be at an