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Traffic signs can be grouped into several types. For example, Annexe 1 of the Vienna Convention on Road Signs and Signals (1968), which on 30 June 2004 had 52 signatory countries, defines eight categories of signs:

A. Danger warning signs
B. Priority signs
C. Prohibitory or restrictive signs
D. Mandatory signs
E. Special regulation signs
F. Information, facilities, or service signs
G. Direction, position, or indication signs
H. Additional panels

In the United States, Canada, Ireland, Australia, and New Zealand signs are categorized as follows:

Regulatory signs
Warning signs
Guide signs
    Street name signs
    Route marker signs
    Expressway signs
    Freeway signs
    Welcome signs
    Informational signs
    Recreation and cultural interest signs
Emergency management (civil defense) signs
Temporary traffic control (construction or work zone) signs
School signs
Railroad and light rail signs
Bicycle signs

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.

A rather informal distinction among the directional signs is the one between advance directional signs, interchange directional signs, and reassurance signs. Advance directional signs appear at a certain distance from the interchange, giving information for each direction. 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 enable drivers to take precautions for the exit (e.g., switch lanes, double check whether this is the correct exit, slow down). They often do not appear on lesser roads, but are normally posted on expressways and motorways, as drivers would be missing exits without them. While each nation has its own system, the first approach sign for a motorway exit is mostly placed at least 1,000 meters (3,300 ft) from the actual interchange. After that sign, one or two additional advance directional signs typically follow before the actual interchange itself.

 

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