While each nation has its own system, the first approach sign for a motorway exit is mostly placed at least 1,000 metres (3,300 ft) from the actual interchange. They often do not appear on lesser roads, but are normally posted on expressways and motorways, as drivers would be missing exits without them. Advance directional signs enable drivers to take precautions for the exit (e.g., switch lanes, double check whether this is the correct exit, slow down). A number of countries do not give information for the road ahead (so-called "pull-through" signs), and only for the directions left and right.
Advance directional signs appear at a certain distance from the interchange, giving information for each direction. In the United States, the categories, placement, and graphic standards for traffic signs and pavement markings are legally defined in the Federal Highway Administration's Manual on Uniform Traffic Control Devices as the standard.Ī rather informal distinction among the directional signs is the one between advance directional signs, interchange directional signs, and reassurance signs. Temporary traffic control ( construction or work zone) signs.Emergency management ( civil defense) signs.In the United States, Canada, Ireland, Australia, and New Zealand signs are categorized as follows: Various international conventions have helped to achieve a degree of uniformity in Traffic Signing in various countries.
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