(a) The driver of a vehicle on any curve may not turn to go in the opposite direction if the vehicle cannot be seen by the driver of any other vehicle that is within 500 feet and approaching from either direction.
(b) The driver of a vehicle on or approaching the crest of any grade may not turn to go in the opposite direction if the vehicle cannot be seen by the driver of any other vehicle that is within 500 feet and approaching from either direction.
Structure Maryland Statutes
Title 21 - Vehicle Laws -- Rules of the Road
Subtitle 6 - Turning and Starting; Signals on Stopping, Turning, and Starting
Section 21-601 - Required Position and Method of Turning at Intersections or Crossovers
Section 21-602 - U-Turn on Curve or Crest of Grade Prohibited
Section 21-603 - Starting Vehicle
Section 21-604 - Turning, Slowing, and Stopping Movements; Required Signals