[CarelessExpert]

So, couple things.

First, it's optimistic to assume that data is accurate and up-to-date.

Second, I can't emphasize my "group consensus" point enough.

Anyone who's driven in real world winter conditions has seen a day where three lane roads turn into two. Or lanes form in the shoulder. It'd be actively dangerous to insist on driving according to the underlying lane markings during those types of road conditions.

Maybe in a world where all cars are autonomous and using map data that could work. In reality it really doesn't.