Artikel 53

1. The lights of the traffic light signals shall be given the following meaning:
(a) In a three-coloured system: Red indicates that vehicular traffic must not pass the signal; Green indicates that vehicular traffic may pass the signal; When amber is used after the green signal, it shall be taken as prohibiting vehicular traffic from proceeding beyond the signal unless the vehicle is so close to the signal when the amber signal first appears that it cannot safely be stopped before passing the signal; — When amber is used in conjunction with or after the red signal, it indicates an impending change in the indications of the signal and shall not be taken as permitting verhicular traffic to proceed.
(b) In the two-colour system: Red indicates that vehicular traffic must not pass the signal; Green indicates that vehicular traffic may pass the signal; The combination of green and red shall have the same meaning as amber after green in the three-colour system.
2. When a single amber intermittent light is used, it shall indicate “caution”.
3. The lights shall be placed one above the other. As a rule the red light shall be placed at the top and the green light at the bottom. Where an amber light is used, it shall be placed between the red and the green lights.
4. When traffic light signals are placed at the side of the carriageway, the height of the lower edge of the lowest light above the carriageway shall normally be not less than 2 m and not more than 3.50 m; where possible, every light signal should be repeated on the opposite side of the intersection. When they are suspended over the carriageway, the height of the lower edge of the lowest light above the carriageway shall be not less than 4.50 m.