	Illuminating surface	Light-emitting surface
Edges are	a and b	c and d

ANNEX 4

FORWARD VISIBILITY OF RED LIGHTS AND REARWARD VISIBILITY OF WHITE LIGHTS

(See paragraph 5.9 of this Regulation)

Figure 1

Forward visibility of a red light

[Bild bitte in Originalquelle ansehen]

Figure 2

Rearward visibility of a white light

[Bild bitte in Originalquelle ansehen]

ANNEX 5

CONTROL OF CONFORMITY OF PRODUCTION

1. TESTS

1.1. Position of lamps

The position of the lamps as specified in paragraph 6 shall be checked in accordance with the general requirements set out in paragraph 5 of this Regulation.

The values measured for the distances shall be such that the individual specifications applicable to each lamp are fulfilled.

1.2. Visibility of lamps

1.2.1.

The angles of geometric visibility shall be checked in accordance with paragraph 2.11 of this Regulation.

The values measured for the angles shall be such that the individual specifications applicable to each lamp are fulfilled except that the limits of the angles may have an allowance corresponding to the ± 3° variation permitted in paragraph 5.3 for the mounting of the light-signalling devices.

1.2.2.