(a) If, on the basis of an engineering and traffic investigation, the State Highway Administration determines that any maximum speed limit specified in this subtitle is greater or less than reasonable or safe under existing conditions on any part of a highway under its jurisdiction, it may establish a reasonable and safe maximum speed limit for that part of the highway.
(b) An engineering and traffic investigation is not required to conform a posted maximum speed limit in effect on December 31, 1974, to a different limit specified in § 21-801.1(b) of this subtitle.
(c) Under this section, the State Highway Administration may:
(1) Establish a maximum speed limit to apply at all times or only at specified times; and
(2) Establish differing limits for different times of day, different types of vehicles, different weather conditions, or other factors bearing on safe speeds.
(d) An altered maximum speed limit established under this section is effective when posted on appropriate signs giving notice of the limit.
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