Have you any idea how long road signage has been around? The first road signs (some are still standing) were erected by the ancient Romans throughout their Empire to give the mileage and direction to Rome. As travel from place to place became more and more frequent during the Middle Ages, it became necessary to erect signposts to give travellers information about where roads led to, and these signposts began to appear at many road junctions. The only information that appeared on road signage back in those days was the distance and the name of the town or village in question – the signpost actually pointed down the road in question. Only when traffic became automated and subsequently faster was there a need for more involved road signs such as speed limits and warnings of hazards ahead.
Most of the road signage that you see today – especially the shapes, colours and sizes, has been laid down by international convention and in particular the United Nations Economic and Social Council in the Vienna Convention on Road Signs and Signals of 1968. Road signs of particular types have to have specific shapes, for example
Triangular signs are warning signs that are used to show danger and to provide information, but essentially information that advises the motorist to be watch out and to be careful.
Circular signs depict an instruction that has to be carried out. Both mandatory and prohibition signs give instructions that have to be carried out.
Rectangular signs are used to show information to drivers. They are found in public information signs such as freeway direction signs, toll-rate signs, selective restriction signs (e.g. time limits for parking) and tourist signs.
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