PART X RULES OF THE ROAD
Signalling turns and stops
142 (1) The driver or operator of a vehicle upon a highway before turning to the left or right at any intersection or into a private road or driveway or from one lane for traffic to another lane for traffic or to leave the roadway shall first see that the movement can be made in safety, and if the operation of any other vehicle may be affected by the movement shall give a signal plainly visible to the driver or operator of the other vehicle of the intention to make the movement.  R.S.O. 1990, c. H.8, s. 142 (1). Signal when moving from parked position (2) The driver or operator of a vehicle parked or stopped on the highway before setting the vehicle in motion shall first see that the movement can be made in safety, and, if in turning the vehicle the operation of any other vehicle may be affected by the movement, shall give a signal plainly visible to the driver or operator of the other vehicle of the intention to make the movement.  R.S.O. 1990, c. H.8, s. 142 (2). Mode of signalling turn (3) The signal required in subsections (1) and (2) shall be given either by means of the hand and arm in the manner herein specified or by a mechanical or electrical signal device as described in subsection (6).  R.S.O. 1990, c. H.8, s. 142 (3). How to signal manually (4) When the signal is given by means of the hand and arm, the driver or operator shall indicate his or her intention to turn, (a)  to the left, by extending the hand and arm horizontally and beyond the left side of the vehicle; or (b)  to the right, by extending the hand and arm upward and beyond the left side of the vehicle.  R.S.O. 1990, c. H.8, s. 142 (4). Idem (5) Despite clause (4) (b), a person on a bicycle may indicate the intention to turn to the right by extending the right hand and arm horizontally and beyond the right side of the bicycle.  R.S.O. 1990, c. H.8, s. 142 (5). Requirements for signalling device (6) A mechanical or electrical signal device shall clearly indicate the intention to turn, shall be visible and understandable during day-time and night-time from the front and from the rear of the vehicle for a distance of 30 metres, and shall be self-illuminated when used at any time from one-half hour after sunset to one-half hour before sunrise.  R.S.O. 1990, c. H.8, s. 142 (6). Signalling devices to be used only for purpose of indicating turn (7) No person while operating or in control of a vehicle upon a highway shall actuate the mechanical or electrical device referred to in subsection (6) for any purpose other than to indicate a movement referred to in subsection (1) or (2).  R.S.O. 1990, c. H.8, s. 142 (7). Signal for stop (8) The driver or operator of a vehicle upon a highway before stopping or suddenly decreasing the speed of the vehicle, if the operation of any other vehicle may be affected by such stopping or decreasing of speed, shall give a signal plainly visible to the driver or operator of the other vehicle of the intention to stop or decrease speed, manually (a)  by means of the hand and arm extended downward beyond the left side of the vehicle; or signalling device (b)  by means of a stop lamp or lamps on the rear of the vehicle which shall emit a red or amber light and which shall be actuated upon application of the service or foot brake and which may or may not be incorporated with one or more rear lamps.  R.S.O. 1990, c. H.8, s. 142 (8). Definition (9) For the purposes of subsections (1) and (8), “vehicle” includes a street car equipped with turn signals or brake lights, as the case may be.  R.S.O. 1990, c. H.8, s. 142 (9).