The idea is that you can return your bike to a hire station before the 30 minutes are up and then take it out again immediately for another 30 minutes. That was an important part of the success of the Paris scheme.
EDIT: Oops, missed laner's post.
@Oliver Schick started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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The idea is that you can return your bike to a hire station before the 30 minutes are up and then take it out again immediately for another 30 minutes. That was an important part of the success of the Paris scheme.
EDIT: Oops, missed laner's post.