Figure 1,,,,
Urban and Rural Roadway Mileage by Surface Type: 1950–1999,,,,
,,,,
Millions of miles,,,,
,"Rural, unpaved","Rural, paved","Urban, unpaved","Urban, paved"
1950,"2,395,235","594,801","137,743","185,196"
1960,"2,197,043","919,082","118,181","311,387"
1970,"1,981,332","1,188,080","90,329","470,341"
1980,"1,740,886","1,490,050","46,259","582,642"
1990,"1,571,999","1,550,283","40,105","704,539"
1999,"1,436,969","1,641,877","42,008","809,549"

"SOURCES:  U.S. Department of Transportation, Federal Highway Administration, Highway Statistics (Washington, DC: Annual ",,,,
"editions), table HM-12. ",,,,
"_____. Highway Statistics Summary to 1995 (Washington, DC: 1997), table HM-212.",,,,