(a) Right Turns. - Both the approach for a right turn and a right turn shall be made as close as practicable to the right-hand curb or edge of the roadway.
(b) Left Turns. - The driver of a vehicle intending to turn left at any intersection shall approach the intersection in the extreme left-hand lane lawfully available to traffic moving in the direction of travel of that vehicle, and, after entering the intersection, the left turn shall be made so as to leave the intersection in a lane lawfully available to traffic moving in the direction upon the roadway being entered.
(c) Local authorities and the Department of Transportation, in their respective jurisdictions, may modify the foregoing method of turning at intersections by clearly indicating by buttons, markers, or other direction signs within an intersection the course to be followed by vehicles turning thereat, and it shall be unlawful for any driver to fail to turn in a manner as so directed.