320When traffic-related item complies substantially with

320 When traffic-related item complies substantially with regulation (1) A traffic-related item complies substantially with this regulation if— (a) it is a reasonable likeness of a diagram in schedule 4 (Symbols and traffic-related items) of that kind of traffic-related item; or

(b) for a traffic-related item of a kind for which there is not a diagram in schedule 4—it complies substantially with a description of that kind of traffic-related item in this regulation and, if the description includes a symbol for which there is a diagram in schedule 4, the symbol on the item is a reasonable likeness of the diagram. (2) A traffic-related item may be a reasonable likeness of a diagram of a kind of traffic-related item mentioned in this regulation even though 1 or both of the following apply to the item: (a) the dimensions of the item, or of anything on the item, are different; (b) the item has additional information. (3) A symbol on a traffic-related item may be a reasonable likeness of a diagram of a kind of symbol mentioned in this regulation even though the dimensions of the symbol, or of anything on the symbol, are different.