(A) 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) Whenever the Commissioner or local authorities within their respective jurisdiction determine on the basis of an engineering and traffic investigation that slow speeds on any part of the highway consistently impede the normal and reasonable movement of traffic, the Commissioner or such 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.
(1991 Code, § 19-80) Penalty, see § 72.999