This already exists in the Netherlands, called the "OV-fiets" (public transport bicycle). You take a subscription (€10 a year), and then using a card you can re

This already exists in the Netherlands, called the "OV-fiets" (public transport bicycle). You take a subscription (€10 a year), and then using a card you can rent a bicycle at almost any railstation for a little less than €3 for 18 hours. You can rent them longer if you want, and even return them to a different place than you got them from (for a fee). Most of these places have manned bicycle storage facilities where you can rent them, but they also have some in automated lockers in lesser frequented locations. They're now also starting to put these in commuter parking spots at edges of cities.