I'd think that in a city of 5 million, there would have to be a few thousand survivors scattered around. D&C already found a couple of different survivor camps in the few buildings they went into. The +15 one appeared to have been attacked by other humans, so there must be a few groups running around.
I guess it isn't a stretch to find an abandoned bike. In some ways a bike has some advantages over cars. Not loud, more agile, never needs fuel and less likely to break down.
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