Oh, this is going to stir up the local cycling community, and probably some motorists, too.
See this story on the Record website. Briefly, a cycling group was on a township road last month when it was overtaken by a truck pulling a horse trailer. The truck may have cut in too soon, and several cyclists hit the ground. Two cyclists and the truck driver have been charged with the Highway Traffic Act offence of careless driving. The driver has been charged with failing to avoid a collision with a bicycle, and the cyclists have also been charged with failing to move to the right when overtaken, and a township bylaw infraction regarding riding two abreast.
Frankly, it sounds like the investigating officers just decided to charge everybody and let the chips fall where they may.
I think the question will be whether riding two abreast (exclusive of the township bylaw) is careless driving, and whether the cyclists needed to pull over to the right.
They are entitled to occupy the entire lane if that lane is not sufficiently wide for both the motor vehicle and the cyclist.
The act says that the slow-moving vehicle must pull to the right as far as "practicable," which is a pretty open definition. While a horse and buggy might be able to straddle the pavement and the gravel shoulder, the law doesn't require the cyclist to hit the shoulder to allow the truck to pass. In urban areas, that "practicable" space includes the space that might be occupied by the opening of a car door, for instance. In rural areas, that practicable space might include allowance for crumbling road edges. The truck is supposed to wait for the opportune moment to pass, just as it would have to wait for a bus or a tractor.
We'll have to await the court date to hear both sides fully, but on the face of the news story cited above, it sounds like both the motorist and the cyclists will need good lawyers.