Unless they changed the rules of the road, the only thing you are really suppose to pass on the right hand side is a street car.
Pretty sure that was even covered in the little booklet they used to give you for free, but now they charge you for.
That little booklet is full of suggestions... not all are laws.
From the HTA...
Passing to right of vehicle
150 (1) The driver of a motor vehicle may overtake and pass to the right of another vehicle only where the movement can be made in safety and,
(a) the vehicle overtaken is making or about to make a left turn or its driver has signalled his or her intention to make a left turn;
(b) is made on a highway with unobstructed pavement of sufficient width for two or more lines of vehicles in each direction; or
(c) is made on a highway designated for the use of one-way traffic only. R.S.O. 1990, c. H.8, s. 150 (1).
Driving off roadway prohibited
(2) No driver of a motor vehicle shall overtake and pass another vehicle by driving off the roadway. R.S.O. 1990, c. H.8, s. 150 (2).
Non-application of subs. (2)
(3) Subsection (2) does not apply to,
(a) a motor vehicle overtaking and passing to the right of another vehicle where the shoulder to the right of the roadway is paved and the vehicle overtaken is making or about to make a left turn or its driver has signalled his or her intention to make a left turn;
(b) an ambulance or fire department vehicle;
(c) a police department vehicle or a vehicle being driven by an officer appointed for carrying out the provisions of this Act;
(d) a tow truck where the driver is responding to a police request for assistance;
(e) a road service vehicle; or
(f) a motor vehicle overtaking and passing to the right of a road service vehicle or road-building machine where a person apparently employed by or on behalf of the authority that is engaged in the highway maintenance operation has directed the driver to pass it and the movement can be made in safety. 2009, c. 5, s. 46 (2).