Table 1-1M,,,,,,,,,,,,,,,,
System Mileage Within the United States (Statute kilometers),,,,,,,,,,,,,,,,
,,1960,1965,1970,1975,1980,1985,1990,1991,1992,1993,1994,1995,1996,1997,1998
Highwaya,,"5,706,240","5,937,942","6,002,985","6,176,897","6,211,806","6,218,364","6,223,214","10,015,292","16,118,051","25,939,488","41,745,560","6,296,117","6,307,743","6,348,214","6,355,127"
"Class I railb,c",,"333,672","321,544","316,202","308,222","265,255","234,584","192,732","310,172","499,173","803,341","1,292,852","174,234","170,235","164,359","161,852"
Amtrakc,,N,N,N,N,"38,624","38,624","38,624","62,160","100,036","160,993","259,093","38,624","40,234","40,234","35,406"
Transitd,,,,,,,,,,,,,,,,
  Commuter railc,,N,N,N,N,N,"5,752","6,649","10,701","17,221","27,714","44,602","6,695","5,926","7,108","8,324"
  Heavy rail,,N,N,N,N,N,"2,081","2,174","3,498","5,630","9,060","14,580","2,346","2,379","2,457","2,457"
  Light rail,,N,N,N,N,N,618,777,"1,250","2,012","3,237","5,210",913,"1,027","1,061","1,088"
Navigable channelse,,"40,234","40,234","41,843","41,843","41,843","41,843","41,843","67,340","108,373","174,409","280,684","41,843","41,843","R41,843","41,843"
Oil pipelinef,,"307,295","339,358","351,917","363,533","351,469","343,764","335,954","540,665","870,116","1,400,316","2,253,591","R356,631","R285,715","R289,478","287,506"
Gas pipelineg,,"1,015,416","1,235,204","1,469,761","1,575,971","1,692,666","1,800,655","1,942,308","3,125,841","5,030,554","8,095,891","13,029,074","2,031,237","2,054,030","R2,013,610","2,059,500"
"a  All public road and street mileage. Prior to 1980, some miles of nonpublic roadways are included. No consistent data on private road mileage are available. ",,,,,,,,,,,,,,,,
Includes District of Columbia.,,,,,,,,,,,,,,,,
"b  Data represent miles of road owned (aggregate length of road, excluding yard tracks, sidings, and parallel lines).",,,,,,,,,,,,,,,,
"c  Portions of Class I freight railroads, Amtrak, and commuter rail networks share common trackage.  Amtrak data represent miles of track operated.",,,,,,,,,,,
d  Transit system mileage is measured in directional route-miles.  A directional route-mile is the mileage in each direction over which public ,,,,,,,,,,,
"transportation vehicles travel while in revenue service.  Directional route-miles are computed with regard to direction of service, but without ",,,,,,,,,,,
regard to the number of traffic lanes or rail tracks existing in the right-of-way.,,,,,,,,,,,
"e  The St. Lawrence Seaway is not included in this number because 3 of the 5 subsections are solely in Canadian waters, and",,,,,,,,,,,
"the others are in international boundary waters. Of the 26,000 miles of navigable waterways, 10,867 miles are commercially significant shallow-",,,,,,,,,,,
draft inland waterways subject to fuel taxes.,,,,,,,,,,,
f  Includes trunk and gathering lines for crude-oil pipeline.,,,,,,,,,,,
"g  Excludes service pipelines.  Data not adjusted to common diameter equivalent.  Mileage as of the end of each year.  Includes field and gathering, ",,,,,,,,,,,
"transmission, and distribution main.  See table 1-8 for a more detailed breakout of oil and gas pipeline mileage.",,,,,,,,,,,
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KEY:  N = data do not exist; R = revised.,,,,,,,,,,,
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NOTE:,,,,,,,,,,,
"Total highway mileage in this table will not match that in tables 1-4 and 1-5 because of a change in the way the U.S. Department of Transportation, Federal Highway ",,,,,,,,,,,
"Administration (FHWA) creates mileage-based tables derived from the Highway Performance Monitoring System, beginning with the 1997 issue of FHWA's ",,,,,,,,,,,
Highway Statistics.,,,,,,,,,,,
SOURCES:,,,,,,,,,,,
Highway:,,,,,,,,,,,
"1960-95: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics Summary to 1995, FHWA-PL-97-009 ",,,,,,,,,,,
"(Washington, DC: Annual issues), table HM-212.",,,,,,,,,,,
"1996-98: Ibid., Highway Statistics (Washington, DC: Annual issues), table HM-12.",,,,,,,,,,,
Class I rail:,,,,,,,,,,,
"1960-98: Association of American Railroads, Railroad Facts (Washington, DC: 1998), p. 44.",,,,,,,,,,,
Amtrak:,,,,,,,,,,,
"1980: Amtrak, Corporate Planning and Development,  personal communication (Washington, DC).",,,,,,,,,,,
"1985-98:  Amtrak, Corporate Planning and Development,  Statistical Appendix to Amtrak Annual Report (Washington, DC: Annual issues).",,,,,,,,,,,
Transit: ,,,,,,,,,,,
"U.S. Department of Transportation, Federal Transit Administration, National Transit Database (Washington, DC: Annual issues), table 18 (1996-1997) and ",,,,,,,,,,,
table 19 (for 1998) and similar tables in earlier editions.,,,,,,,,,,,
Navigable channels:,,,,,,,,,,,
"1960-96: U.S. Army Corps of Engineers, Ohio River Division, Huntington District, Ohio River Navigation System Report, 1996, Commerce on the ",,,,,,,,,,,
"Ohio River and its Tributaries (Fort Belvoir, VA: 1996), p. 2.",,,,,,,,,,,
"1997-1998: Waterborne Commerce Statistics Center Databases, personal communication, June 2000.",,,,,,,,,,,
Oil pipeline:,,,,,,,,,,,
"1960-98: Eno Transportation Foundation, Inc., Transportation in America, 1998 (Washington, DC: 1999), p. 64.  ",,,,,,,,,,,
Gas pipeline:,,,,,,,,,,,
"1960-98: American Gas Association, Gas Facts (Arlington, VA : Annual issues), table 5-2 and similar tables in earlier editions.",,,,,,,,,,,
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