UK traffic sign: Vehicles exceeding a gross weight of 20T prohibited (TSRGDNO 626.1); This is a deprecated design or diagram, reconstructed from analysis of the 1981 Schedule, and the 2002 era working drawings. It may not be wholly accurate.
Traffic Signs Regulations and General Directions 1981; Working drawings for Traffic Signs -  [1] namely the Alphabet Working Drawings here [2]

, and extrapolation of details thereof.; Redrawn by uploader
UK Government - Redrawn by User:Rcsprinter123 and others;