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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).
Before the development of reflective plastics, reflectivity was provided by glass reflectors set into the lettering and symbols. New generations of traffic signs based on electronic displays can also change their text (or, in some countries, symbols) to provide for "intelligent control" linked to automated traffic sensors or remote manual input.
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.
Highway symbols and markers Every state in the U.S. and province in Canada has different markers for its own highways, but uses standard ones for all federal highways. Many special highways – such as the Queen Elizabeth Way , Trans-Canada Highway , and various auto trails in the U.S. – have used unique signs.
However, UN compliant signs must make use of more pictograms in contrast to more text based US variants. Indeed, most American nations make use of more symbols than allowed in the US MUTCD. Unlike in Europe, considerable variation within road sign designs can exist within nations, especially in multilingual areas.
The Swiss road signs are defined in the Road Signs Act, which is based on several laws and ordinances.Liechtenstein largely follows the legislation of Switzerland. The principal law for road signs in Switzerland is the Road Signs Act (German: Signalisationsverordnung (SSV), French: Ordonnance du sur la signalisation routière (OSR), Italian: Ordinanza sulla segnaletica stradale (OSStr)). [3]
Road signs in Tanzania are based on the SADC Road Traffic Signs Manual, [1] [2] [3] a document designed to harmonise traffic signs in member states of the Southern Africa Development Community.
Longitudinal lines (lanes and margins) and symbols on the carriageway are always white (but in Norway a yellow line separates two-way traffic and in Ireland edge lines are yellow). Temporary markings are yellow in Germany, France, Italy, the Netherlands and Spain, but red/orange in Liechtenstein, Switzerland and Russia, and white in the United ...