Transportation Network Length: 2006, 2016

miles
Mode 2006 2016
Highway
Public roads
4,016,741
4,140,108
Public road lanesa
8,420,589
8,711,076
Pipeline
Gas distribution
2,343,696
2,528,560
Gas transmission and gathering
321,222
317,930
Rail
Class I freight railroad
94,801
93,011
Amtrak
21,708
21,358
Transit
Commuter railb
6,972
7,745
Heavy railb
1,623
1,646
Light railb,c
1,280
1,958
Water
Navigable waterwaysd
25,000
25,000

Notes:

aMeasured in lane-miles. bMeasured in directional route-miles. cLight Rail was revised beginning in 2011 and includes light rail, street car rail, and hybrid rail. dEstimated length of domestic waterways.

Sources:

Highway, Pipeline, Rail, Transit, and Water: As cited in U.S. Department of Transportation, Bureau of Transportation Statistics, National Transportation Statistics, tables 1-1, 1-6, and 1-10, available at https://www.bts.gov/.

Last Updated: April 2018