2 the convention classes all road signs into a number of categories (A – H): A: Danger warning signs B: Priority signs C: Prohibitory or restrictive signs D: Mandatory signs E: Special regulation signs F: Information, facilities, or service signs G: Direction, position, or indication sign H: Additional panels The convention then lays out precise colours, sizes, and shapes for each of these classes of sign: † May be written in English or the national language It also specifies the symbols and pictograms which may be used, and the orientations in which they may be used. When more than one is available, the same one must be used nationally. All signs, except for those that do not apply at night, must be reflective enough to be seen in darkness with headlights from a distance. Road markings The convention also specifies road markings. All such markings must be less than high, with cat's eye reflectors no more than above the road surface. The road markings shall be white or yellow. The length and width of markings varies according to purpose, although no exact figures for size are stated; roads in built up areas should use a broken line for lane division, while continuous lines must only be used in special cases, such as reduced visibility or narrowed carriageways. All words painted on the road surface should be either of place names, or of words recognisable in most languages, such as "Stop" or "Taxi". Traffic lights The Convention specifies the colours for traffic lights and their meanings, and places and purposes lights may be used for, like so: Red flashing lights may only be used at the locations specified above; any other use of the lights is in breach of the convention. Red lights must be placed on top when lights are stacked vertically, or on the side closest to oncoming traffic if stacked horizontally. Contracting parties The convention has 71 state parties and 35 signatories (including acceding members) as of October 2022: Albania, Armenia, Austria, Bahrain, Belarus, Belgium, Benin, Bosnia and Herzegovina, Brazil, Bulgaria, Central African Republic, Chile, Costa Rica, Côte d'Ivoire, Croatia, Cuba, Cyprus, Czech Republic, Democratic Republic of the Congo, Denmark, Ecuador, Estonia, Finland, France, Georgia, Germany, Ghana, Greece, Guyana, Holy See, Hungary, India, Indonesia, Iran, Iraq, Italy, Kazakhstan, Kuwait, Kyrgyzstan, Latvia, Liberia, Liechtenstein, Lithuania, Luxembourg, North Macedonia, Mexico, Moldova, Mongolia, Montenegro, Morocco, Myanmar, Netherlands, Nigeria, Norway, Pakistan, Paraguay,