Document ID: chunk:federal_register_of_legislation:F2010C00150:front:0:p21
Version: federal_register_of_legislation:F2010C00150
Segment Type: other
Provision Reference: 
Character Range: 57788–60491

accordance with the requirements of Regulation No. 13-H in its original form.
Model B
(See paragraph 4.5. of this Regulation )

a = 8mm min.
The above approval mark affixed to a vehicle shows that the vehicle type concerned has been approved in the United Kingdom (E11) pursuant to Regulation Nos. 13-H and 24[1/]. (In the case of the latter Regulation the corrected absorption coefficient is 1.30m-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.
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% 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% 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%.

         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