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One type of regulatory signs are traffic signs intended to instruct road users on what they must or should do (or not do) under a given set of circumstances. Other types may be signs located on streets and in parking lots having to do with parking, signs in public parks and on beaches or on or in architectural facilities prohibiting specific types of activities. The term regulatory sign describes a range of signs that are used to indicate or reinforce traffic laws, regulations or requirements which apply either at all times or at specified times or places upon a street or highway, the disregard of which may constitute a violation, or signs in general that regulate public behavior in places open to the public.
Examples of non-traffic types of regulatory signs might be tow-away signs for vehicles without disabled parking stickers or no-smoking signs where there are laws prohibiting smoking.
- Federal Highway Administration. "Section 1A.13 Definitions of Words and Phrases in This Manual". Manual on Uniform Traffic Control Devices (html or pdf) (2003 ed.). Washington, DC. p. 1A-12. Retrieved 2009-03-01.
Regulatory Sign—a sign that gives notice to road users of traffic laws or regulations.