Just went over Leutenants Island bridge (Wellfleet MA) which can only crossed at low tide. Its the only way to the island (except private small boat). The island is just residential and everyone living there knows about this (or finds out the hard way). It occurred to me that the nav system doesn't account for the tide. I didn't expect it to check the tides but it would be sort of cool if it did. There are probably other bridges or roads with the tidal limitations, though they are few.