I think the GP post also points out that some roads are, frankly, terrible. I've had more than a few times where I wasn't clear if the cones were set in such a

I think the GP post also points out that some roads are, frankly, terrible. I've had more than a few times where I wasn't clear if the cones were set in such a way that I could continue down the road or not and I've been wrong at least once (though the cop was very understanding after I explained it). Some randomly placed cones are enough to confuse humans in many circumstances, as well. I doubt we'll ever have an all-encompassing solution for that, either. Even for things like autonomous-only lane, well it's not like everyone obeys the HOV lanes currently... There probably isn't a perfect solution, especially when I've seen plenty of ambiguous markings.