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http://www.e-laws.gov.on.ca/html/statutes/english/elaws_statutes_90h08_e.htm#BK239

159. (1) ...

Slow down on approaching stopped emergency vehicle
(2) Upon approaching an emergency vehicle with its lamp producing intermittent flashes of red light or red and blue light that is stopped on a highway, the driver of a vehicle travelling on the same side of the highway shall slow down and proceed with caution, having due regard for traffic on and the conditions of the highway and the weather, to ensure that the driver does not collide with the emergency vehicle or endanger any person outside of the emergency vehicle. 2009, c. 5, s. 49.
Same
(3) Upon approaching an emergency vehicle with its lamp producing intermittent flashes of red light or red and blue light that is stopped on a highway with two or more lanes of traffic on the same side of the highway as the side on which the emergency vehicle is stopped, the driver of a vehicle travelling in the same lane that the emergency vehicle is stopped in or in a lane that is adjacent to the emergency vehicle, in addition to slowing down and proceeding with caution as required by subsection (2), shall move into another lane if the movement can be made in safety. 2009, c. 5, s. 49.