How to turn left at intersections

(a) Left turns on other than two-way roadways. At any intersection where traffic is restricted to one direction on one or more of the roadways, the driver of a vehicle intending to turn left at any such intersection shall approach the intersection in the extreme left-hand lane lawfully available to traffic moving in the direction of travel of such vehicle, and after entering the intersection, the left turn shall be made so as to leave the intersection as nearly as practicable in the left-hand lane lawfully available to traffic moving in the direction of travel upon the roadway being entered. (b) Left turns where both streets or roadways are one-way. The approach for a left turn and a left turn shall be made as close as practicable to the left-hand curb or edge of the roadway, except as otherwise permitted by pavement markings or other official traffic control devices. (c) In all cases where official marks, buttons, signs, or directional arrows painted on the pavement are placed within or adjacent to intersections, no driver of a vehicle shall execute a movement at such intersections otherwise than as directed and required by such marks, buttons, signs, or arrows. )