bikes in the sky with diamonds

http://www.treehugger.com/files/2010/05/bike-lanes-in-the-sky.php

Tires attached to a wire. Suspended in space?
(Turns green and pukes.) No thanks.

But the others...

Elevating bike lanes addresses the clash with drivers.

----
Parking garages.
When land is cheap, every little developer has their own little parking lot.
Those parking lots are too small to practically build a multi-level parking garage when intensification occurs.
Well, if you treat each clump of 4 developments holistically, and regulate building placement respectively, you can build said
parking garages later.