Document ID: chunk:federal_register_of_legislation:F2023C00919:body:0:p57
Version: federal_register_of_legislation:F2023C00919
Segment Type: other
Provision Reference: 
Character Range: 171068–173957

they shall be positioned at a height compatible with the requirements of the width and the symmetry of the lamps, and at a vertical distance as large as the shape of the bodywork makes it possible, but not less than 600 mm above the mandatory lamps.
6.7.4.2.2.              For S3 or S4 categories devices:
The horizontal plane tangential to the lower edge of the apparent surface shall: either not be more than 150 mm below the horizontal plane tangential to the lower edge of the exposed surface of the glass or glazing of the rear window, or not be less than 850 mm above the ground.
However, the horizontal plane tangential to the lower edge of the apparent surface of a S3 or S4 category device shall be above the horizontal plane tangential to the upper edge of the apparent surface of S1 or S2 categories devices.
6.7.4.3.                        In length:
6.7.4.4.                        For S1 or S2 categories devices:  at the rear of the vehicle.
6.7.4.5.                        For S3 or S4 categories devices:  no special requirement.
6.7.5.                              Geometric visibility
Horizontal angle:
For S1 or S2 categories devices: 45° to the left and to the right of the longitudinal axis of the vehicle.
However, for the stop lamps of categories S1 and S2 mounted below 750 mm (measured according to the provisions of paragraph 5.8.1. above), the inward angle of 45° may be reduced to 20° under the H plane.
For S3 or S4 categories devices: 10° to the left and to the right of the longitudinal axis of the vehicle;
Vertical angle:
For S1 or S2 categories devices: 15° above and below the horizontal.
However,
             (a) Where a lamp is mounted below 750 mm (measured according to the provisions of paragraph 5.8.1. above), the downward angle of 15° may be reduced to 5°;
             (b) Where an optional lamp is mounted above 2,100 mm (measured according to the provisions of paragraph 5.8.1. above) the upward angle of 15° may be reduced to 5°.
For S3 or S4 categories devices: 10° above and 5° below the horizontal.
6.7.6.                              Orientation
Towards the rear of the vehicle.
6.7.7.                              Electrical connections
6.7.7.1.                        All stop lamps shall light up simultaneously when the braking system provides the relevant signal defined in Regulations Nos. 13 and 13-H.
6.7.7.2.                        The stop lamps need not function if the device, which starts and/or stops the engine, is in a position that makes it impossible for the engine to operate.
6.7.8.                              Tell-tale
Tell-tale optional, however, a tell-tale indicating failure is mandatory if required by the component regulation.
Where the above tell-tale is fitted, this tell-tale shall be an operating tell-tale consisting of a non-flashing warning light which comes on in the event of the malfunctioning of