I remember seeing something like this else where. IIRC, the vehicle behind is supposed to is recommended to leave space
Quote:
162 (1) A driver of a vehicle must not cause or permit the vehicle to follow another vehicle more closely than is reasonable and prudent, having due regard for the speed of the vehicles and the amount and nature of traffic on and the condition of the highway.
(2) The driver of a commercial motor vehicle or a combination of vehicles, when driving on a roadway outside a business or residence district, must not follow within 60 m of another commercial motor vehicle or a combination of vehicles, but this must not be construed to prevent one commercial motor vehicle or a combination of vehicles overtaking and passing another.
(3) The driver of a motor vehicle in a caravan or motorcade, other than a funeral procession, outside a business or residence district, must leave sufficient space between his or her vehicle and another vehicle or combination of vehicles to enable a vehicle to enter and occupy that space without danger.
Divided highways
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So, as long as they are within that they are clear so most likely would be 50/50.