Actually, I think they will FOLD as long as it's under 10-8 mph.

I've squeezed through congested streets with double parked trucks....and no room with the mirror to squeeze through. Have def. folded them in to squeeze through. Can't recall if it I had had to brake but I'm pretty sure if you are at a snails pace, the system will let you engage them.

The OP is more about it auto-retracting back out.