Document ID: chunk:federal_register_of_legislation:F2023C00919:body:0:p53
Version: federal_register_of_legislation:F2023C00919
Segment Type: other
Provision Reference: 
Character Range: 160316–163116

distance shall not exceed 2,500 mm:
(a) For M1 and N1 category vehicles;
             (b) For all other categories of vehicles if the structure of the vehicle makes it impossible to comply with the minimum angles of visibility.
Optional category 5 side direction indicator lamps, shall be fitted, spaced evenly, along the length of the vehicle.
Optional category 6 side direction indicator lamp shall be fitted in the area between the first and last quartiles of the length of a trailer.
6.5.5.                              Geometric visibility
6.5.5.1.                        Horizontal angles: (see figure below)
Vertical angles: 15° above and below the horizontal for direction indicator lamps of categories 1, 1a, 1b, 2a, 2b and 5.
However:
             (a) Where a lamp is mounted below 750 mm (measured according to the provisions of paragraph 5.8.1), the downward angle of 15° may be reduced to 5°;
             (b) Where an optional rear 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°.
30° above and 5° below the horizontal for direction indicator lamps of category 6.

Figure (see paragraph 6.5.)

         (*) The value of 5° given for dead angle of visibility to the rear of the side direction-indicator is an upper limit d ≤ 1.80 m (for M1 and N1 category vehicles d ≤ 2.50 m).

For the direction indicator lamps of categories 1, 1a, 1b, 2a and 2b mounted below 750 mm (measured according to the provisions of paragraph 5.8.1), the inward angle of 45° may be reduced to 20° under the H plane.

6.5.5.2.                        Or, at the discretion of the manufacturer, for M1 and N1 category vehicles: Front and rear direction indicator lamps, as well as side-marker lamps (**).
Horizontal angles: (see figure below)
         (**) The value of 5° given for the dead angle of visibility to the rear of the side direction-indicator is an upper limit. d ≤ 2.50 m

However, for the direction indicator lamps of categories 1, 1a, 1b, 2a and 2b 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.
Vertical angles: 15° above and below the horizontal. However, where a lamp is mounted below 750 mm (measured according to the provisions of paragraph 5.8.1), the downward angle of 15° may be reduced to 5°.
To be considered visible, the lamp shall provide an unobstructed view of the apparent surface of at least 12.5 square centimetres, except for side direction-indicators of categories 5 and 6. The illuminating surface area of any retro-reflector that does not transmit light shall be excluded.
6.5.6.                              Orientation
According to the specifications for installation by the