[ghaff]

This gets back to whether the road in question is something you should direct the average smartphone user down given that they'll probably blindly follow the instructions. In many cases, the answer is no. If they know (or tink they know what they're doing), they can make their own decisions.

I'd actually much rather a smartphone routing algorithm err on the side of caution in this regard.

[ashtonkem]

That’s a really good point that I’ve never thought about. Some of the roads I’ve driven on were very much in the “you know what your ground clearance is, right?” category. It’s probably for the best that Apple and google don’t blindly send people that way.