PART X RULES OF THE ROAD
Turning at intersections
141 (1) In this section, “centre line” means, (a)  in the case of a highway on which traffic is permitted to move in opposing directions, the marked line or median that divides traffic moving in opposing directions on the highway or, where there is no marked line or median, the centre of the roadway, and (b)  in the case of a highway designated for the use of one-way traffic, the left curb or edge of the roadway.  R.S.O. 1990, c. H.8, s. 141 (1). Right turn at intersection (2) Where a driver or operator of a vehicle intends to turn to the right into an intersecting highway, he or she shall, where the highway on which he or she is driving has marked lanes for traffic, approach the intersection within the right-hand lane or, where it has no such marked lanes, by keeping immediately to the left of the right curb or edge of the roadway and he or she shall make the right turn by entering the right-hand lane of the intersecting highway where the lane is marked or, where no such lane is marked, by keeping immediately to the left of the right curb or edge of the roadway being entered.  R.S.O. 1990, c. H.8, s. 141 (2). Right turn, where multiple lanes (3) Despite subsection (2), where more than one lane of a highway has been designated as a right-turn lane, the driver or operator of a vehicle intending to turn to the right into an intersecting highway shall approach the intersection in one of the lanes and leave the intersection in the lane of the intersecting highway that corresponds to the lane from which the turn was commenced.  R.S.O. 1990, c. H.8, s. 141 (3). Exception (4) A driver of a road service vehicle entering an intersection within a lane other than one described in subsection (2) or (3) may make a right turn from the approach lane if the turn can be safely made.  R.S.O. 1990, c. H.8, s. 141 (4). Left turn, across path of approaching vehicle (5) No driver or operator of a vehicle in an intersection shall turn left across the path of a vehicle approaching from the opposite direction unless he or she has afforded a reasonable opportunity to the driver or operator of the approaching vehicle to avoid a collision.  R.S.O. 1990, c. H.8, s. 141 (5). Left turn, at intersection (6) Where a driver or operator of a vehicle intends to turn to the left into an intersecting highway, he or she shall, where the highway on which he or she is driving has marked lanes for traffic, approach the intersection within the left-hand lane provided for the use of traffic moving in the direction in which his or her vehicle is proceeding or, where it has no such marked lanes, by keeping immediately to the right of the centre line of the highway and he or she shall make the left turn by entering the intersection to the right of the centre line or its extension and by leaving the intersection in the left-hand lane provided for the use of traffic moving in the direction in which his or her vehicle is proceeding where the lane is marked or, where no such lane is marked, by passing immediately to the right of the centre line of the intersecting highway.  R.S.O. 1990, c. H.8, s. 141 (6). Left turn, where multiple lanes (7) Despite subsection (6), where more than one lane of a highway has been designated as a left-turn lane, the driver or operator of a vehicle intending to turn to the left into an intersecting highway shall approach the intersection in one of the lanes and leave the intersection in the lane of the intersecting highway that corresponds to the lane from which the turn was commenced.  R.S.O. 1990, c. H.8, s. 141 (7). Exception (8) A driver of a road service vehicle entering an intersection within a left-turn lane may leave the intersection without turning to the left if the movement can be safely made.  R.S.O. 1990, c. H.8, s. 141 (8). Long vehicles (9) Where, because of the length of a vehicle or combination of vehicles, a turn cannot be made within the confines of the lanes referred to in subsection (2), (3), (6) or (7), a driver, when making such a turn, is not in contravention of any such subsection if he or she complies with the applicable provision as closely as practicable.  R.S.O. 1990, c. H.8, s. 141 (9). Signalling turns and stops