Beyond passing another vehicle and preparing for a left turn, HTA Section 147 lists two more specific exceptions to the "keep right" rule. What are they?

Correct answer: C. A road service vehicle, and a bicycle travelling in a lane designated for contraflow travel

Section 147(2) exempts four situations from the keep-right requirement: overtaking and passing, preparing for a left turn, a road service vehicle, and a bicycle travelling in a lane specifically designated for contraflow (opposite-direction) travel. The first two are well-known; the road-service-vehicle and contraflow-bicycle-lane exceptions are easy to miss.

Source: MTO Driver's Handbook: Highway Traffic Act, Section 147(2), keeping to the right — exceptions