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Map of the U S Interstate System
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104 TUNNELS AASHO AMERICA'S FIRST INTERSTATE America's Highways American asphalt Autobahn automobile became began beltway Boston built Bureau of Public cable-stayed bridge called cars concrete Conestoga wagons Congress construction convoy country's crews deck Divided Highways downtown drivers Eisenhower Eisenhower Tunnel engineering Federal Highway Administration feet Fells Point ﬁnal ﬁnd ﬁrst ﬁve funding girders highway department Highway System highway's IKE'S GRAND PLAN INTERSTATE DECADE interstate highway Interstate Highway System Interstate System Interstate System highways land lanes largest Lincoln Highway MacDonald miles million motorists mountain National Road nearly neighborhoods numbers ofﬁce ofﬁcials Ohio pass path paved Pennsylvania percent President Public Roads railroad Red Ball Express road building road's ROADS OF IRON roadway Route 66 sections signs slurry walls steel superhighway surface suspension bridge Today toll trafﬁc trails Transportation trip trucks truss Turnpike U.S. Route United urban USDOT/FHWA vehicles wagons Washington Weingroff wheels York