I would agree with the bicycle if the assumption is that you're going to ride the bicycle all the way from point A to B. But, like in the NYC example (like 9/11), maybe you need to hoof it over the rivers, but once on the other side, it's possible that public transit is available, but you'll need to take a series of buses, subways, or trains. You'd likely have to dump the bike in such a situation because there just wouldn't be room for it on public transit.