First, two caveats.
One, this involves the provinces too, because the vehicle's driving on roads inside their province, so the answer won't be entirely federal.
Two, we shouldn't be shy about borrowing what's been done elsewhere, rather than reinventing the wheel, because we're a middle-sized player. If we can find a large set of rules that work, either in the U.S. or in Europe, we could consider looking elsewhere.
Three, when things are changing so quickly, the answer may not be in legislation right now, but we need to be ready, to have a framework ready, so we can then put the rules in afterwards.