|A NO sign at the entrance to the Preston Bypass in 1958|
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The term NO sign refers to an older style of sign used at the entrance to motorways to indicate prohibited classes of vehicles and road users. Between its introduction in 1958 as part of the Anderson report and the 1975 regulations, it appeared with four different designs. It was replaced with the so-called "chopsticks sign" on motorways by the Traffic Signs Regulations and General Directions 1975.
On non-motorway Special Roads, such as the A55 Colwyn Bay Bypass and Conwy Tunnel, a modified variant is used. Where A-roads feature some restrictions, but are not necessarily Special Roads, an edited NO sign is occasionally used. Examples can be seen on the A12 in East London and on the A20 near the Roundhill Tunnel in Kent.
There is no standard layout of a modern NO sign.