If the driver of a vehicle intends to turn right at any intersection, he shall approach the intersection and make the right turn as close as practicable to the right-hand curb or edge of the roadway. If the driver of a vehicle intends to turn left at any intersection or crossover, he shall approach the intersection or crossover in the extreme left-hand lane lawfully available to traffic moving in the same direction. If the driver of a vehicle intends to turn left at any intersection or crossover, the driver shall, after entering the intersection or crossover, make the left turn so as to leave the intersection in a lane lawfully available to traffic moving in the same direction on the roadway being entered. The State Highway Administration or any local authority may place a traffic control device at or near any intersection in its jurisdiction and, with it, direct that vehicles turning at the intersection travel a course different from one specified in this section. At an intersection where a traffic control device is placed under this subsection, the driver of a vehicle may not turn otherwise than as directed by the device.

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. 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.

A person may not start a vehicle that is stopped, standing, or parked until the movement can be made with reasonable safety. A person may not start a vehicle that is stopped, standing, or parked until, if any other vehicle might be affected by the movement, he gives an adequate signal to approaching traffic.

A person may not turn a vehicle at an intersection, unless the vehicle is in the position required by § 21-601 of this subtitle. A person may not turn a vehicle to enter a private road or driveway or otherwise turn a vehicle from a direct course or move it right or left on a roadway or from a shoulder or bikeway onto a roadway, unless the movement can be made with reasonable safety. A person may not, if any other vehicle might be affected by the movement, turn a vehicle until he gives an appropriate signal in the manner required by this subtitle. When required, a signal of intention to turn right or left shall be given continuously during at least the last 100 feet traveled by the vehicle before turning; except that a bicyclist may interrupt the turning signal to maintain control of the bicycle. If there is an opportunity to signal, a person may not stop or suddenly decrease the speed of a vehicle until he gives an appropriate signal in the manner required by this subtitle to the driver of any other vehicle immediately to the rear. The signals provided for in § 21-605(b) and (c) of this subtitle: May be used to indicate an intention to turn, change lanes, or start from a stopped, standing, or parked position; and May not be flashed as a courtesy or “do pass” signal to the driver of any other vehicle approaching from the rear.

Except as provided in subsections (b) and (c) of this section, each required stop or turn signal shall be given: By hand and arm in conformity with § 21-606 of this subtitle; or By signal lamps. Each motor vehicle in use on a highway shall be equipped with and the required signal given by signal lamps, if the distance from the center of the top of the steering post to the left outside limit of the body, cab, or load of the vehicle is more than 24 inches. Each motor vehicle in use on a highway shall be equipped with and the required signal given by signal lamps if, for any vehicle or combination of vehicles, the distance from the center of the top of the steering post to the rear limit of the body or load is more than 14 feet.

Except as otherwise provided, each required signal given by hand and arm shall be given from the left side of the vehicle in the manner specified in this section. A left turn signal is given by the hand and arm extended horizontally. A right turn signal is given by the hand and arm extended upward; except that a bicyclist may extend the right hand and arm horizontally to the right. A stop or decrease in speed signal is given by the hand and arm extended downward.