Many countries place signs on the side of roads, called traffic signs or road signs, to deliver information to passing motorists. Different languages cause barriers, so international signs with symbols have been developed in Europe and adopted in most countries and areas in the world. Annex 1 of the Convention on Road Signs and Signals, of 8 November 1968 has 8 categories of signs:
Countries and areas categorize road signs in different ways. The categories in the United States are:
See also: Street sign theft