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Interstate Highways Quiz
play.howstuffworks.com/quiz/interstate-highways-quiz
This vast web of interconnected roads helps to power America's economic and military might. How much do you know about the interstate highway system?
What's the Secret Behind the Numbers on the Interstate Signs?
auto.howstuffworks.com/numbers-on-interstate-signs.htm
Why is one road named I-5 while another is I-480? We take a closer look at the digits on those red, white and blue shield-shaped signs.
Post-war Railroads
history.howstuffworks.com/american-history/post-war-railroads.htm
Post-war railroads chronicles the height of American railroad transportation. Learn about railroads and post-war railroads.
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