traffic_2_500.jpg
http://www.edmunds.com/ownership/driving/articles/121971/article.html


traffic_IMG_0451.jpg
http://picasaweb.google.com/pendsan/PendseInLondon#5228675019051481474


traffic_sciencedaily.jpg
http://www.sciencedaily.com/releases/2007/12/071219103102.htm


Traffic_jam_Rio_de_Janeiro_03_2008_28.JPG
http://commons.wikimedia.org/wiki/Image:Traffic_jam_Rio_de_Janeiro_03_2008_28.JPG


traffic_jam3.jpg
http://www.oecd.org/document/17/0,3343,en_39315735_39312980_39401489_1_1_1_1,00.html

bay_bridge_traffic_520c
http://www.jmg-galleries.com/blog/2007/10/15/environmental-impact-photography-blog-action-day/