The London SkyCycle concept by +Foster + Partners
has been generating a lot if internet buzz lately. It immediately reminded me of this Velo-city project idea from 2005 - http://bicycledesign.net/2006/01/bike-tubes-in-the-sky/
Before that there were many other “bike tube in the sky" concepts going back to the late 19th century. Is it finally an idea that's time has come? I sort of doubt it. What do you think?