Most countries post signage, known as traffic signs or road signs, at the side of roads to impart information to road users. Since language differences can create barriers to understanding, international signs using symbols in place of words have been developed in Europe and adopted in most countries and areas of the world.

The Vienna Convention on Road Signs and Signals is an international treaty designed to increase road safety and aid international road traffic by standardising the road signs, traffic lights and road markings in use internationally. This convention was agreed upon by the United Nations Economic and Social Council at the UNESC Conference on Road Traffic in Vienna 7 October 1968 to 8 November 1968, and came into force 6 June 1978. This conference also produced the Vienna Convention on Road Traffic, which complements this legislation by standardising international traffic laws.

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