4.5.4. Position 4.5.4.1. Width:
The edge of the illuminating surface furthest from the median longitudinal plane of the vehicle must not be more than 400 mm from the extreme outer edge of the vehicle.
The distance between the inner edges of the two illuminating surfaces shall be not less than 600 mm.
Where the vertical distance between the rear direction indicator lamp and the corresponding rear position (side) lamp is not more than 300 mm, the distance between the extreme outer edge of the vehicle and the outer edge of the rear direction indicator lamp must not exceed by more than 50 mm the distance between the extreme outer edge of the vehicle and the outer edge of the corresponding rear position (side) lamp.
For front direction indicator lamps the illuminating surface must be not less than 40 mm from the illuminating surface of the dipped-beam headlamps or front fog lamps, if any. A smaller distance is permitted if the luminous intensity in the reference axis of the direction indicator lamp is equal to at least 400 cd.
4.5.4.2. Height:
Above the ground : not less than 500 mm for direction indicator lamps in category 5;
not less than 350 mm for direction indicator lamps in categories 1 and 2;
not more than 1 500 mm for all categories.
If the structure of the vehicle makes it impossible to keep to this maximum figure, the highest point on the illuminating surface may be at 2 300 mm in the case of direction indicator lamps in category 5 and at 2 100 mm in the case of direction indicator lamps in categories 1 and 2.
4.5.4.3. Length:
The distance between the centre of reference of the illuminating surface of the side indicator (arrangement "A") and the transverse plane which marks the forward boundary of the vehicle's overall length, shall not exceed 1 800 mm. If the structure of the vehicle makes it impossible to comply with the minimum angles of visibility, this distance may be increased to 2 500 mm if the vehicle is equipped in conformity with arrangement "A".
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