Document ID: chunk:federal_register_of_legislation:F2021C00476:body:0:p29
Version: federal_register_of_legislation:F2021C00476
Segment Type: other
Provision Reference: 
Character Range: 81853–84691

= 8 mm min.

The above approval mark affixed to a vehicle shows that the vehicle type concerned has, with regard to braking, been approved in the United Kingdom (E11) pursuant to Regulation No. 13‑H under approval number 002439.  The first two digits of the approval number indicate that the approval was granted in accordance with the requirements of Regulation No. 13-H in its original form.  The additional marking "ESC" indicates that the vehicle meets the Electronic Stability Control requirements of Annex 9 to this Regulation."

Model B
(See paragraph 4.5. of this Regulation)

The above approval mark affixed to a vehicle shows that the vehicle type concerned has been approved in the United Kingdom (E11) pursuant to Regulations Nos. 13-H and 24 1/.  (In the case of the latter Regulation the corrected absorption coefficient is 1.30 m-1).  The approval numbers indicate that, at the dates when the respective approvals were given, Regulation No. 13‑H was in its original form and Regulation No. 24 included the 02 series of amendments.
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1/ This number is given merely as an example.
Annex 3

BRAKING TESTS AND PERFORMANCE OF BRAKING SYSTEMS

              1.   BRAKING TESTS

              1.1.    General

         1.1.1.  The performance prescribed for braking systems is based on the stopping distance and the mean fully developed deceleration.  The performance of a braking system shall be determined by measuring the stopping distance in relation to the initial speed of the vehicle and/or by measuring the mean fully developed deceleration during the test.

         1.1.2.  The stopping distance shall be the distance covered by the vehicle from the moment when the driver begins to actuate the control of the braking system until the moment when the vehicle stops; the initial speed shall be the speed at the moment when the driver begins to actuate the control of the braking system; the initial speed shall not be less than 98 per cent of the prescribed speed for the test in question.

           The mean fully developed deceleration (dm) shall be calculated as the deceleration averaged with respect to distance over the interval vb to ve , according to the following formula:

                where:

                 vo = initial vehicle speed in km/h,
                 vb = vehicle speed at 0.8 vo in km/h,
                 ve = vehicle speed at 0.1 vo in km/h,
                 sb = distance travelled between vo and vb in metres,
                 se = distance travelled between vo and ve in metres.

           The speed and distance shall be determined using instrumentation having an accuracy 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