There are three basic types of traffic sign: signs that give orders,signs
that warn and signs that give information. Each type has adifferent shape.
A further guide to the function of a sign is itscolour. All triangular
signs are red.
Circles
Give Orders
Triangles
warn
Rectangles
inform
Blue
circles generally give a mandatory instruction,such as "turn left",
or indicate a route available only to particular classes of traffic,
e.g. buses and cycles only
Red rings or circles tell you what you must not do, e.g.
you must not exceed 30 mph, no vehicles over the height shown may
proceed
Blue
rectangles are used for information signs except on motorways where
blue is used for direction signs
Green
rectangles are used for direction signs on primary routes
White
used for direction signs on non-primary routes, or for plates used
in combination with warning and regulatory signs
There
are a few exceptions to the shape and colour rules, to give certain
signs greater prominence. Examples are the "STOP" and "GIVE WAY"
signs
The words "must" or "must not", when used in the descriptionsthat follow,
refer to legal requirements that have to be obeyed.
