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Art. 70 Ordinance of September 5, 1979, on Road Signage (OSR) - Appearance and Use of Light Signals
Art. 70 OSR · Appearance and Use of Light Signals
The flashing yellow light used as a warning for road users (Art. 68, para. 6) is only authorized in the following cases: a. in conjunction with a green arrow (Art. 68, para. 3); b. when light signal installations are switched off; c. near construction sites; d. before dangerous obstacles located on the roadway; e. near pedestrian crossings (Art. 77), at island terminals, etc.; f. on the side of highways during accidents, traffic jams, fog, ice, and other similar hazards; g. ...
The rotating yellow light is prohibited.
Red lights used alone, red arrows, light installations without red lights, as well as flashing signal lights, are not permitted, except near level crossings (Art. 93). Green lights used alone are only authorized as repeat signals.
Light installations with red and yellow lights, but without green lights, may be used only in exceptional cases, particularly near fire service garages, near construction sites, near terminal loops of public vehicles in line traffic, near airfields, at the entrance and inside tunnels, and near level crossings.
Light installations with red and green lights, but without yellow lights, may be used only in specific cases and solely within the framework of managing highway and semi-highway ramps. The green light that flashes when the installation is activated indicates that the light will soon turn red.
When lights are placed one above the other in light installations, the red light will be at the top, the green light at the bottom, and, if applicable, the yellow light in between. The lights will have a round shape.
When lights are placed side by side in light installations fixed above the roadway, the red light will be on the left, the green light on the right, and, if applicable, the yellow light in the middle. The lights will have a round shape.
Lights intended for pedestrians bear the silhouette of a pedestrian (Art. 68, para. 7); they may be rectangular in shape. Lights intended for cyclists and moped riders bear the silhouette of a cycle (Art. 68, para. 8), if they are also visible to other vehicle drivers; when combined with lights intended for pedestrians, they may be rectangular in shape.
Only white lights arranged in a particular manner (Art. 69, para. 2) may be used as special signals intended for public vehicle drivers in line traffic.
The light signals, except repeat signals, must be placed on a rectangular black panel with a white border; this panel is not necessary when any glare from the sun or other light sources is excluded.