What is the effect of the removal of a freeway? What is a bike boulevard and how does it function?
What are sharrows or buffered bike lanes? All these questions and more can be answered on the Streetfilms video blog website.
Streetfilms is focused on New York City but many of the urban design issues can applied to any urban area and especially Philadelphia. Look for this site to borrow content (Creative Commons license) from Streetfilms often.