Document ID: chunk:federal_register_of_legislation:F2023C00136:reg:113:p12
Version: federal_register_of_legislation:F2023C00136
Segment Type: reg
Provision Reference: reg 113 (pt 12/21)
Character Range: 46816–49620

No red light shall be visible towards the front and no white light shall be visible towards the rear. Compliance with this requirement shall be verified as shown hereunder (see drawing in Annex 4):
5.9.1. Visibility of red light towards the front: a red lamp must not be directly visible to an observer moving in zone 1 of a transverse plane situated 25 m forward of the foremost point on the vehicle;
5.9.2. Visibility of white light towards the rear: a white lamp must not be directly visible to an observer moving in zone 2 of a transverse plane situated 25 m rearward of the rearmost point on the vehicle;
5.9.3. In their respective planes, the zones 1 and 2 explored by the eye of the observer are bound:
         5.9.3.1. In height, by two horizontal planes 1 m and 2.2 m respectively above the ground;
         5.9.3.2. In width, by two vertical planes which, forming to the front and the rear respectively an angle of 15° outwards from the vehicle's median longitudinal plane, pass through the point or points of contact of vertical planes parallel to the vehicle's median longitudinal plane and delimiting the vehicle's over-all width; if there are several points of contact, the foremost shall correspond to the forward plane and the rearmost to the rearward plane.
5.10. The electrical connections shall be such that the front position lamp or the passing-beam headlamp, if there is no front position lamp, the rear position lamp and the rear-registration-plate illuminating device cannot be switched ON or OFF otherwise than simultaneously, unless otherwise specified.
5.10.1. In the case of an interdependent lamp system, all light sources shall be switched on and off simultaneously.
5.11. In the absence of specific instructions, the electrical connection shall be such that the driving-beam headlamp, the passing-beam headlamp and the fog lamp cannot be switched on unless the lamps referred to in paragraph 5.10. above are likewise switched on. This requirement need not, however, be satisfied in the case of the driving-beam headlamp and passing-beam headlamp where their luminous warnings consist in switching on the passing-beam headlamp intermittently, at short intervals, or in switching on the driving-beam headlamp intermittently, or in switching on the passing-beam headlamp and driving-beam headlamp alternately at short intervals.
5.11.1. If installed, the daytime running lamp shall automatically be ON when the engine is running. If the headlamp is switched on, the daytime running lamp shall not come on when the engine is running.
If no daytime running lamp is installed, the headlamp shall automatically be on when the engine is running.
5.12.  Tell-tale lamps
5.12.1. Every tell-tale lamp shall be readily visible to a driver in the normal driving position.
5.12.2. Where