The Traffic Signs (Amendment) General Directions 2004
These Directions amend direction 42 of the Traffic Signs General Directions 2002 (mounting and backing of signs). The amendments provide that, if the front of a backing board is coloured yellow, it may be reflectorised, fluorescent or both reflectorised and fluorescent. A yellow backing board for a combination of a sign shown in diagram 2402.1 (name of a town or village commencing immediately ahead) with a sign shown in diagram 670 (maximum speed limit in miles per hour) on the same backing board may be of any shape, including rectangular.