If exposed to weather it is an automatic fail. Sorry, that is just how it works. From any transportation alternative that is no enclosed it always comes down to comfort. One day it is too hot, another too cold, or too wet, and on and on, until the excuse is no longer needed as the alternative mode is parked.<p>So any bicycle or pedestrian friendly environment needs weather protection as part of its design. It does not need be fully enclosed but that type of protection may be required depending on climate. Perhaps a convertible system where panels retract?