ARCHIVED: This Practice Note has been archived and is not maintained. Definitions A traffic sign is defined in section 64(1) of the Road Traffic Regulation Act 1984 (RTRA 1984) to mean: ‘…any object or device (whether fixed or portable) for conveying, to traffic on roads or any specified class of traffic, warnings, information, requirements, restrictions or prohibitions of any description– (a) specified by regulations made by the relevant authority or (b) authorised by the relevant authority, and any line or mark on a road for so conveying such warnings, information, requirements, restrictions or prohibitions.' The definition therefore includes all the types of sign which will be very familiar to road users namely: • warning signs (mostly triangular with a red border) • mandatory prohibition signs (mostly circular with a red border) • mandatory signs (mostly circular and blue), and • information signs (mostly rectangular) This last category includes direction signs, place name signs and street name signs, but also includes