You're much more likely to infect someone else by riding the subway than you are riding a bicycle. It spreads best in enclosed spaces with calmer air. It does

You're much more likely to infect someone else by riding the subway than you are riding a bicycle. It spreads best in enclosed spaces with calmer air. It doesn't transmit well outside, unless you're breathing right up in front of someone's face (which just doesn't happen on a bicycle, but might happen with e.g. pedestrians waiting in close formation for a light).