Unfortunately the highway traffic act is not very concise so printing off a page from it to shove in peoples windows isn't really an option. Here are the key points I think:

“vehicle” includes a motor vehicle, trailer, traction engine, farm tractor, road-building machine, bicycle and any vehicle drawn, propelled or driven by any kind of power, including muscular power, but does not include a motorized snow vehicle or a street car; (“véhicule”)

Vehicles meeting bicycles

(4) Every person in charge of a vehicle on a highway meeting a person travelling on a bicycle shall allow the cyclist sufficient room on the roadway to pass. R.S.O. 1990, c. H.8, s. 148 (4).

Bicycles overtaken

(6) Every person on a bicycle or motor assisted bicycle who is overtaken by a vehicle or equestrian travelling at a greater speed shall turn out to the right and allow the vehicle or equestrian to pass and the vehicle or equestrian overtaking shall turn out to the left so far as may be necessary to avoid a collision. R.S.O. 1990, c. H.8, s. 148 (6).

Approaching ridden or driven horses, etc.

167. Every person having the control or charge of a motor vehicle or motor assisted bicycle on a highway, when approaching a horse or other animal that is drawing a vehicle or being driven, led or ridden, shall operate, manage and control the motor vehicle or motor assisted bicycle so as to exercise every reasonable precaution to prevent the frightening of the horse or other animal and to ensure the safety and protection of any person driving, leading or riding upon the horse or other animal or being in any vehicle drawn by the horse or other animal. R.S.O. 1990, c. H.8, s. 167.


So these rules are really unclear and don't make sense and check it out, horses get better treatment than cyclists.