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1. The road markings mentioned in Articles 26 to 28 of this Convention may be painted on the carriageway or applied in any other way provided that it is equally effective.
2. If road markings are painted, they shall be yellow or white; however, blue may be used for markings showing places where parking is permitted but subject to some conditions or restrictions (limit of duration, payment, category of user, etc.). When both yellow and white are used in the territory of a Contracting Party, markings of the same class shall be of the same colour. For the purposes of this paragraph, the term “white” shall include shades of silver or light grey.
3. In tracing out the inscriptions, symbols and arrows of road markings, account shall be taken of the need to elongate them considerably in the direction of movement of traffic, because of the very narrow angle at which they are seen by drivers.
4. Road markings intended for moving vehicles shall be easily recognized in good time by drivers. They must be visible during the day and at night. It is recommended that such markings, especially in areas where lighting is insufficient, be retroreflective.