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{{uksi/paragraph/1|s1=20|text=Signs shown in diagrams 810, 830.1, 831 and 832 (except when varied to contain the words "weight check") may be used only in connection with a traffic census the taking or which on a road has been approved by the highway authority {or that road by the chief officer or police of the police area in which the road is situate, and by or on behalf or the secretary of State.}}