Most regulatory signs are rectangular in shape with the long axis vertical and have a black legend on white background.
However, other shapes and colours may be specified for signs where there is a special need for easy identification.
A regulatory sign may require the addition of a supplementary sign which should be a white sign of the same width as the regulatory sign.
Where a special inscription is needed on an enlarged sign it should be shown in black below the main instructions. It should be as clear and as simple to understand as possible to ensure that the conditions imposed by the sign are enforceable.
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More information available at State Road Authroities Links