Circular road signs are available in 300mm, 450mm and 600mm sizes.
Other sizes available on request
Class RA1 Engineering Grade or RA2 High Intensity Prismatic reflectivity
Wall mounted or with rear channel for post fixing
In areas of street lighting (except on motorways), a speed limit of 30mph applies unless another speed limit is specifically signed.
Official specification Sign Posts.
The Department for Transport encourages the use of either '20 mph speed limits' or '20 mph speed limit zones' in urban situations where vulnerable road users are at particular risk.
Traffic calming zones are located in areas with a high level of pedestrians such a town centres or schools. The end of the 20 mph speed limit traffic calming zone sees the limit increased to 30 mph.