(a) Unless reduced speed is necessary for the safe operation of the vehicle or otherwise is in compliance with law, a person may not willfully drive a motor vehicle at such a slow speed as to impede the normal and reasonable movement of traffic.
(b) (1) If, on the basis of an engineering and traffic investigation, the State Highway Administration or a local authority determines that slow speeds on any part of a highway in its jurisdiction impede the normal and reasonable movement of traffic, the State Highway Administration or the local authority may establish a minimum speed limit for that part of the highway.
(2) Unless reduced speed is necessary for the safe operation of the vehicle or otherwise is in compliance with law, a person may not drive a vehicle below a minimum speed limit established under this subsection.
(3) A minimum speed limit established under this subsection is effective when posted on appropriate signs giving notice of the limit.
(c) A person may not drive a Class A (passenger) or Class M (multipurpose) vehicle on a highway if the maximum speed capability of the vehicle does not exceed the posted maximum speed limit for the highway by at least 5 miles per hour.
Structure Maryland Statutes
Title 21 - Vehicle Laws -- Rules of the Road
Subtitle 8 - Speed Restrictions
Section 21-801.1 - Maximum Limits
Section 21-802 - Establishment of State Speed Zones
Section 21-802.1 - Highway Work Zones
Section 21-803 - Alteration of Maximum Speed Limit by Local Authorities
Section 21-803.1 - School Zones
Section 21-803.2 - Establishment of Speed Limits on School and College Property
Section 21-804 - Minimum Speed Regulation
Section 21-805 - Display of "Slow Moving Vehicle" Emblem
Section 21-805.1 - Driving a Limited Speed Vehicle
Section 21-806 - Special Speed Limitations for Elevated Structures
Section 21-807 - Charging Violations
Section 21-808 - Notice to Cosigner of Minor's Application of Speeding Violations
Section 21-809 - Citations Based on Speed Monitoring Systems