Development of Interstate Highway System

The Interstate Highway System was not completed nationwide until the 1970s.  It had been in the planning stages for nearly half a century.

Interest in the Interstate System was renewed in 1939 when the Bureau of Public Roads submitted a report to congress advocating the construction of a special system of direct interregional highways.

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http://www.wisconsinhistory.org/archstories/late_roads/interstate_system.asp

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