Section 56-5-1560 - Minimum speed limits(a) Impeding traffic by slow speed prohibited. -No person shall drive a motor vehicle at such a slow speed as to impede the normal and reasonable movement of traffic except when reduced speed is necessary for safe operation or in compliance with law.(b) Establishing minimum speed zones; signs. Whenever the Department of Transportation or local authorities within their respective jurisdictions determine on the basis of an engineering and traffic investigation that slow speeds on any part of a highway consistently impede the normal and reasonable movement of traffic, the Department of Transportation or local authority may determine and declare a minimum speed limit below which no person shall drive a vehicle except when necessary for safe operation or in compliance with law, when appropriate signs giving notice thereof are erected along the part of the highway for which a minimum speed limit is established. Also any minimum speed limit adopted by a municipality for a section of the state highway within the municipality shall not be effective until such minimum speed has been approved by the Department of Transportation.1993 Act No. 181, Section 1407; 1966 (54) 2244; 1956 (49) 1648; 1949 (46) 466; 1952 Code Section 46-372; 1962 Code Section 46-365.