| http://www.w3.org/ns/prov#value | - Any such maximum speed limit may be declared to be effective at all times or at such times as are indicated upon the said signs; and differing limits may be established for different times of day, different types of vehicles, varying weather conditions, and other factors bearing on safe speeds, which shall be effective (a) [(1)] when posted upon appropriate fixed or variable signs or (b) [(2)] if
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