I think he's referring to this section of the General Regulations for big game in Alberta:
"unlawful to......discharge a weapon within 183 m (200 yards) or cause a projectile from a weapon to pass within 183 m (200 yards) of any occupied building. Owners, occupants, or persons authorized by the owner or occupant are excepted, subject to local bylaws.
discharge a firearm from or cause a projectile from a firearm to pass along or across:
a) a provincial highway (this designation applies to all former primary and secondary highways),
b) a road that is paved, oiled, graded or regularly maintained, unless
- the road is held under any active disposition under the Public Lands Act or under an order under the Surface Rights Act, or
- the person is hunting game birds with a shotgun under the authority of a licence.
Note: if there is no identifiable ditch or fence to mark the outside edge of the roadway, then the roadway extends 20 feet from the edge of the traveled portion."
That first part is key, a bow falls under the definition of "weapon" in the hunting regulations.