U.S. Vehicle-Kilometers

KEY: N = data do not exist; R = revised; U = data are not available.

a All operations other than those operating under 14 CFR 121 and 14 CFR 135. Data for 1996 are estimated using new information on nonrespondents and are not comparable to earlier years. Mileage in source is multiplied by 1.151 to convert to nautical-miles for 1985-1997.

b 1960-2006 data are for Passenger Cars and Other 2-axle, 4-tire vehicles, respectively. Data for 1960-2006 are not comparable to data for 2007-15. 

c U.S. Department of Transportation, Federal Highway Administration (FHWA),...

Estimated U.S. Roadway Lane-Kilometers by Functional System

^a Includes the 50 States and the District of Columbia.

^bUrban other arterial includes other freeways and expressways, other principal arterial, and minor arterial. Rural other arterial includes other principal arterial and minor arterial prior to 2009 and other freeways and expressways, other principal arterial and minor arterial for 2009 and later.

^cCollector is the sum of major and minor collectors. 

Kilometers of Public Roads and Streets in the United States by Type of Surface

KEY:  N = data does not exist.

^a 1960-95 data includes the 50 states and the District of Columbia; 1996-2008 data includes the 50 states, District of Columbia, and Puerto Rico; 2011-16 data includes the 50 states and the District of Columbia; 2017-18 data includes the 50 states, Puerto Rico (data may be incomplete), and the District of Columbia.

^b  Paved mileage includes the following categories: low type (an earth, gravel, or stone roadway that has a bituminous surface course less than 1" thick); intermediate type (a mixed...

System Kilometers Within the United States

KEY:  N = data do not exist; R = revised; U = data are not available.

^a All public road and street mileage in the 50 states and the District of Columbia. For years prior to 1980, some miles of nonpublic roadways are included. No consistent data on private road mileage are available. Beginning in 1998, approximately 43,000 miles of Bureau of Land Management Roads are excluded. 2010 Missouri and Wyoming's data are 2009.

^b Data represent miles of road owned (aggregate length of road, excluding yard tracks, sidings, and parallel lines...

Hazardous Materials Fatalities, Injuries, Accidents, and Property Damage Data

KEY: R = revised. 

^a The 1996 spike in Air Fatalities was due to the ignition of an undeclared cache of chemical oxygen generators in a flight over Florida that killed 110 people, according to the U.S. Department of Transportation Biennial Report on Hazardous Materials Transportation, 1996-1997. 

^bWater category includes only nonbulk marine. Bulk marine hazardous materials incidents are reported to the U.S. Coast Guard and are not included.

^cOther category includes freight...

Motor Vehicles Scrapped

KEY:  R = revised; U = data are unavailable.

Table has been discontinued. There will be no further data updates for this table due to source informational no longer being available.

Highway-Rail Grade-Crossing Safety

KEY: R = revised. 

^a 1970 data are not comparable to later years due to a change in the reporting system.

Highway Noise Barrier Construction

KEY: R = revised.

^a  A Type I barrier is built on a new highway project or a physically altered existing highway.

^b  A Type II barrier is built to abate noise along an existing highway (often referred to as retrofit abatement) and is not mandatory.

^c All other types of barriers are nonfederally funded.

^d Have not been assigned a year of construction or a cost.

U.S. Hazardous Materials Shipments by Transportation Mode, 2017

KEY: S = withheld because estimate did not meet publication standards. 

^a Truck as a single mode includes shipments that went by private truck only, for-hire truck only, or a combination of both.

^b Private truck refers to a truck operated by a temporary or permanent employee of an establishment or the buyer/receiver of the shipment.

^c Excludes most shipments of crude oil.  See previous table for the estimated amount of crude oil and petroleum products transported in the United States.

Crude Oil and Petroleum Products Transported in the United States by Mode

KEY: N = data do not exist; R = revised.