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The title page of the Vienna Convention on Road Signs and Signals. The Convention on Road Signs and Signals, commonly known as the Vienna Convention on Road Signs and Signals, is a multilateral treaty to standardize the signing system for road traffic (road signs, traffic lights and road markings) in use internationally.
Signs and markings British traffic signs from the Highway Code; Danish traffic signs Archived 2016-12-20 at the Wayback Machine; securite-routiere.gouv.fr (in French) Know Your Traffic Signs - Department for Transport (UK) German traffic signs and signals; Norma 8.,1-IC Style manual for road signs in Spain (in Spanish)
11th edition of the MUTCD, published December 2023. In the United States, road signs are, for the most part, standardized by federal regulations, most notably in the Manual on Uniform Traffic Control Devices (MUTCD) and its companion volume the Standard Highway Signs (SHS).
The Manual on Uniform Traffic Control Devices for Streets and Highways (usually referred to as the Manual on Uniform Traffic Control Devices, abbreviated MUTCD) is a document issued by the Federal Highway Administration (FHWA) of the United States Department of Transportation (USDOT) to specify the standards by which traffic signs, road surface markings, and signals are designed, installed ...
Part of the treaty was the Vienna Convention on Road Signs and Signals, which defined the traffic signs and signals. As a result, in Western Europe the traffic signs are well standardized, although there are still some country-specific exceptions, mostly dating from the pre-1968 era.
French sign showing the difference between French and Swiss motorway sign colours, on the A411 near Geneva. The main differences relate to Graphic design details; Local regulatory significance; The colour-coding of directional signs; Local language texts (sometimes bilingual) The meaning and colour-coding of horizontal road surface markings
These signs are generally rectangular in shape and use white, black and red/or as their primary colors. Warning signs are traffic signs that are used to warn road users about a potential danger. These signs are usually diamond in shape and, except for temporary traffic control signs, have black legends and borders on a yellow background.
There are also a number of American signatories to the Vienna Convention on Road Signs and Signals: Argentina, Brazil, Chile, Cuba, Ecuador, French Guiana, Paraguay, and Suriname. Of those, only Chile, Cuba, and French Guiana have ratified the treaty. Mandatory action signs in the Americas tend to be influenced by both systems.