I just checked if Google Maps would give me driving directions through streets I know are closed because of the hurricane. It would and does.
An example -- 57th St is closed between 6th Ave and 8th Ave due to the crane collapse. Yet if I ask for directions from 501 West 57th to 501 East 57th, it gives me a straight line.
It's at times like this when utilities like Google Maps can help the most. Wouldn't it be great if it were kept up to date on road closures and could take that into account in giving directions.