Source : http://blogs.trb.com
Related posts:
USA MAP
Tallest Skyscrapers
How construction cranes work - Heavy Lifters [Infographic]
Ten Most Expensive Cars to Insure
All the News 2009
History of Social Games [Infographic]
Automobiles and the Environment [Infographic]
The 50 State Capitol Buildings of the United States Illustrated to Scale
Planet Size Comparison Chart
U.S. Military Personnel Deployments by Country