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Saturday, January 15, 2011

Transportation in the United States

Transportation in the United States is facilitated by road, air, rail, and water networks. The vast majority of passenger travel occurs by automobile for shorter distances, and airplane for longer distances. In descending order, most cargoes travel by railroad, truck, pipeline, or boat; air shipping is typically used only for perishables and premium express shipments.

Ownership and jurisdiction

The overwhelming majority of roads in the United States are owned and maintained by state and local governments. Federally maintained roads are generally found only on federal lands (such as national parks) and at federal facilities (like military bases). The Interstate Highway System is funded by the federal government but maintained by state governments. There are a few private highways in the United States, which use tolls to pay for construction and maintenance. There are many local private roads, generally serving remote or insular residences.
Passenger and freight rail systems, bus systems, water ferries, and dams may be under either public or private ownership and operation. Civilian airlines are all privately owned and financed. Most airports are owned and operated by local government authorities, but there are also some private airports. The Transportation Security Administration has provided security at most major airports since 2001.
The United States Department of Transportation and its divisions provide regulation, supervision, and funding for all aspects of transportation, except for customs, immigration, and security, which are the responsibility of the United States Department of Homeland Security. Each state has its own Department of Transportation, which builds and maintains state highways, and depending upon the state, may either directly operate or supervise other modes of transportation.
Aviation law is almost entirely a federal matter, while automobile traffic laws are enacted and enforced by state and local authorities. Economic jurisdiction over tidelands is shared between the state and federal governments, while the United States Coast Guard is the primary enforcer of law and security on US waterways.

Mode share

In most American cities, the majority of commutes are made by singly-occupied automobiles.

Mode of passenger transportPassenger-miles
Highway — total4,884,55788.79%
Passenger vehicles, motorcycles4,520,81082.18%
Air Carriers583,68910.61%
Rail — total30,9720.56%
All other modes (e.g., ferryboats)2,0910.04%
Source: 2005 estimates by the Bureau of Transportation Statistics[1]

Passenger transportation is dominated by a network of over 3.9 million miles of highways which is pervasive and highly developed by global standards. Passenger transportation is dominated by passenger vehicles (including cars, trucks, vans, and motorcycles), which account for 86% of passenger-miles traveled. The remaining 14% was handled by planes, trains, and buses.
As of 2003, there were 759 automobiles per 1,000 Americans, compared to 472 per 1,000 inhabitants of the European Union the following year. The US intercity passenger rail system is limited in scope. Bicycle usage is minimal.

Mode of intercity
freight transport
Ton-miles (millions)Percent
Domestic water transportation591,27613.03%
Oil and oil products572,00012.60%
Natural Gas331,8117.31%
Source: 2005 estimates by the Bureau of Transportation Statistics[7]

Freight transportation is carried by a variety of networks. The largest percentage of US freight is carried by trucks (60%), followed by pipelines (18%), rail (10%), ship (8%), and air (0.01%). Other modes of transportation, such as parcels and intermodal freight accounted for about 3% of the remainder. Air freight is commonly used only for perishables and premium express shipments. The difference in percentage of rail's share by ton-miles and by weight (10% vs 38%) is accounted for by the extreme efficiency of trains. A single railroad locomotive may pull fifty boxcars full of freight while a truck only pulls one. Trucks surpass trains in the weight category due their greater numbers, while trains surpass trucks in the ton-miles category due to the vast distances they travel carrying large amounts of freight.
Usually cargo, apart from petroleum and other bulk commodities, is imported in containers through seaports, then distributed by road and rail. The quasi-governmental United States Postal Service has a monopoly on letter delivery (except for express services) but several large private companies such as FedEx and UPS compete in the package and cargo delivery market.

Truck transport in Eastern Washington


U.S. passenger fatalities per billion passenger-miles, 2002-2007
Passenger fatalities
per billion passenger miles
Passenger car127,12415,958,620 M7.97
Light rail799,980 M7.92
Motor bus399117,982 M3.38
Commuter rail10559,736 M1.76
Heavy rail (subway)10686,900 M1.22
Railroad (intercity)3633,234 M1.08
Airline1133,326,286 M0.03


Speed to destination is an important factor in choosing a mode of transportation. In the late 18th century overland transportation was by horse, while water and river transportation was primarily by sailing vessel. The United States population was centered on its Atlantic coast, with all major population centers located on a natural harbor or navigable waterway. Low population density between these centers resulted in a heavily reliance on coastwise and riverboat shipping. The first government expenditures on highway transportation were funded to speed the delivery of overland mail, such as the Boston Post Road between New York City and Boston. Due to the distances between these population centers and the cost to maintain the roads, many highways in the late 18th century and early 19th century were private turnpikes. Other highways were mainly unimproved and impassable by wagon at least some of the year. Economic expansion in the late 18th century to early 19th century spurred the building of canals to speed goods to market, of which the most prominently successful example was the Erie Canal.
Development of the mid-western and southern states drained by the Mississippi River system (Mississippi, Ohio and Missouri Rivers) was accelerated by the introduction of steamboats on these rivers in the early 19th Century. Prior to the introduction of steamboats, transit upstream was impractical because of strong currents on parts of these waterways. Steamboats provided both passenger and freight transportation until the development of railroads later in the 19th Century gradually reduced their presence.
The rapid expansion of Railroads brought the canal boom to a sudden end, providing a quick, scheduled and year round mode of transportation that quickly spread to interconnect the states by the mid-19th century. During the industrialization of the United States after the Civil War, railroads, led by the transcontinental rail system in the 1860s, expanded quickly across the United States to serve industries and the growing cities. During the late 19th century, railroads often had built redundant routes to a competitor’s road or built through sparsely populated regions that generated little traffic. These marginal rail routes survived the pricing pressures of competition, or the lack of revenue generated by low traffic, as long as railroads provided the only efficient economical way to move goods and people across the United States. In addition to the intercity passenger network running on Class I and II railroads, a large network of interurban (trolley or "street running") rail lines extended out from the cities and interchanged passenger and freight traffic with the railroads and also provided competition.
The advent of the automobile signaled the end of railroads as the predominant transportation for people and began an era of mobility in the United States that added greatly to its economic output. The early 20th century Lincoln Highway and other auto trails gave way in the 1920s to an early national highway system making the automobile the preferred mode of travel for most Americans. Interurban rail service declined, followed by trolley cars due in part to the advent of motorized buses and the lack of dedicated rights-of-way but also by deliberate efforts to dismantle urban rail infrastructure (see Great American streetcar scandal). The scarcity of industrial materials during World War Two slowed the growth of the automobile, briefly reemphasizing much of the nation's declining rail network. In the 1950s, the United States renewed building a network of high-capacity, high-speed highways to link its vast territory. The most important element is the Interstate Highway system, first commissioned in the 1950s by President Dwight D. Eisenhower and modeled after the Italian autostrada and the German Autobahn system.
With the advent of commercial airline industry, intercity rail began to suffer a loss of ridership. As the civil air transportation network of airports and other infrastructure expanded, air travel became more accessible to the general population. Technological advances ushered in the jet age, which increased airline capacity, while decreasing travel times and the cost of flights. The costs of flying rapidly decreased intercity rail ridership by the late 1960s to a point where railroads could no longer profitably operate networks of passenger trains. By the early 1970s almost all passenger rail operation and ownership had been transferred to various federal, municipal and state agencies. Passenger rail came to be heavily subsidized, as it is today.
Freight railroads continued to decline as motor freight captured a significant portion of the less-than-carload business. This loss of business, when combined the highly regulated operating environment and constrained pricing power, forced many railroads into receivership and the nationalization of several critical eastern carriers into the Consolidated Rail Corporation (Conrail). Deregulation of the railroads by the Staggers Act in 1980 created a regulatory environment more favorable to the economics of the railroad industry. In the 1990s, the increase in foreign trade and intermodal container shipping led to a revival of the freight railroads, which have effectively consolidated into two eastern and two western private transportation networks: Union Pacific and BNSF in the west, and CSX and Norfolk Southern in the east. Canadian National Railway took over the Illinois Central route down the Misssippi River valley.
Wartime expediency encouraged long distance pipeline transport of petroleum and natural gas, which was greatly expanded in the middle 20th century to take over most of the domestic long-haul market.

Road transportation

Infrastructure and private automobile use
 Numbered highways in the United States

The Interstate highway system is the largest national expressway network in the world.

Maximum speed limits in the United States vary by state from 60 to 80 mph.
In comparison to most of the Western world, the United States relies much more heavily on its roads both for commercial and personal transit. Car ownership is nearly universal except in few of the largest cities where extensive mass transit systems have been built.
With the development of the extensive Eisenhower Interstate Highway System in the 1950s, both long-distance trips and daily the commute were mostly by private automobile. This network was designed to exacting federal standards in order to receive federal funding. The system, as of 2004, has a total length of 46,837 miles (75,376 km), making it both the largest expressway system in the world and the largest public works project in US history.
The Interstate system joined an existing National Highway System, comprising 160,000 miles (256,000 kilometers) of roadway, a fraction of the total mileage of roads. The Interstate system serves nearly all major U.S. cities, often through the downtown areas (a point which triggered freeway and expressway revolts in the 1960s and 1970s). The distribution of virtually all goods and services involves Interstate highways at some point.Residents of American cities commonly use urban Interstates to travel to their places of work. The vast majority of long-distance travel, whether for vacation or business, is by the national road network;of these trips, about one-third (by the total number of miles driven in the country in 2003) utilize the Interstate system.
In addition to the routes of the Interstate system, there are those of the US Highway system, not to be confused with the above mentioned National Highway System. These networks are further supplemented by State Highways, and the local roads of counties, municipal streets, and federal agencies, such as the Bureau of Indian Affairs. Altogether there are more than 4,209,835 km of paved roads in the U.S. (including 75,040 km of expressways), and 2,255,964 km of unpaved roads.
All highways are maintained by state governments, although they receive federal aid to build and maintain freeways signed as part of the 46,000 mile (75,000 km) nationwide Interstate highway network. A large number of expressways are actually government or privately-operated toll roads in many East Coast and Midwestern states. West Coast freeways are generally free to users ("freeways", no toll charged per use), although since the 1990s there have been some small experiments with toll roads operated by private companies.
After the collapse of the I-35W Mississippi River bridge in Minnesota in August 2007, the backlog of road and bridge maintenance across the country became a prominent political issue.
As of 2010, seatbelt use is mandatory in all states except New Hampshire.

Intercity bus
Greyhound Lines is the largest intercity bus company in the United States, with routes in all parts of the continental U.S.. There are also many smaller regional bus companies, many of which use the terminal and booking facilities provided by Greyhound. Intercity bus is, in most cases, the least expensive way to travel long distances in the US.


A traffic jam on a typical American freeway, the Santa Monica Freeway in Los Angeles.
Traffic congestion, especially at rush hour, is a problem in many of the country's larger cities. A 2009 study found that traffic congestion costs the US almost $87.2 billion. The economic costs of traffic congestion have increased 63% over the past decade, and despite declining traffic volumes, caused by the economic downturn, Americans still waste more than 2.8 billion gallons of fuel each year as a result of traffic congestion. Motorists also waste 4.2 billion hours annually, or one full work week per traveler.


Trucking industry in the United States
The trucking industry (also referred to as the transportation or logistics industry) involves the transport and distribution of commercial and industrial goods using commercial motor vehicles (CMV). In this case, CMVs are most often trucks; usually semi trucks, box trucks, or dump trucks. A truck driver (commonly referred to as a "trucker") is a person who earns a living as the driver of a CMV.
The trucking industry provides an essential service to the American economy by transporting large quantities of raw materials, works in process, and finished goods over land—typically from manufacturing plants to retail distribution centers. Trucks are also important to the construction industry, as dump trucks and portable concrete mixers are necessary to move the large amounts of rocks, dirt, concrete, and other building materials used in construction. Trucks in America are responsible for the majority of freight movement over land, and are vital tools in the manufacturing, transportation, and warehousing industries.
Large trucks and buses require a commercial driver's license (CDL) to operate. Obtaining a CDL requires extra education and training dealing with the special knowledge requirements and handling characteristics of such a large vehicle. Drivers of CMVs must adhere to the hours of service, which are regulations governing the driving hours of commercial drivers. These, and all other rules regarding the safety of interstate commercial driving, are issued by the Federal Motor Carrier Safety Administration (FMCSA). The FMCSA is also a division of the United States Department of Transportation (USDOT), which governs all transportation-related industries such as trucking, shipping, railroads, and airlines. Some other issues are handled by another branch of the USDOT, the Federal Highway Administration (FHWA).
Developments in technology, such as computers, satellite communication, and the internet, have contributed to many improvements within the industry. These developments have increased the productivity of company operations, saved the time and effort of drivers, and provided new, more accessible forms of entertainment to men and women who often spend long periods of time away from home. In 2006, the U.S. Environmental Protection Agency implemented revised emission standards for diesel trucks (reducing airborne pollutants emitted by diesel engines) which promises to improve air quality and public health.
[edit]Roadway links with adjacent countries and non-contiguous parts of the US
Canada - Yes.
Mexico - Yes.
Alaska - Yes, via Canada and the Alaska Marine Highway in Washington
Russia - No, but proposed via Bering Strait crossing
Cuba - No. Since the American embargo against Cuba, car ferry service from Florida and New Orleans to Havana ceased in 1962.

Air transportation

An aircraft landing at London Heathrow Airport. Traveling by air is the most popular means of long-distance passenger travel in the US.
The United States has advanced air transportation infrastructure which utilizes approximately 5,000 paved runways. In terms of passengers, seventeen of the world's thirty busiest airports in 2004 were in the U.S., including the world's busiest, Hartsfield-Jackson Atlanta International Airport. In terms of cargo, in the same year, twelve of the world's thirty busiest airports were in the U.S., including the world's busiest, Memphis International Airport. Private aircraft are also used for medical emergencies, government agencies, large businesses, and individuals, see general aviation).
Due to the geography of the United States and the generally large distances between major cities, air transportation is the preferred method of travel for trips over 300 miles (480 km), such as for business travelers and long distance vacation travelers. For cities closer together, such as Boston and New York City, New York and Washington D.C., and Philadelphia and D.C., air travel does not carry the majority of intercity traffic.
There is no single national flag airline; passenger airlines in the United States have always been privately-owned. There are over 200 domestic passenger and cargo airlines and a number of international carriers. The international carriers of the U.S. are Delta Air Lines, American Airlines, United Airlines and US Airways. There is currently no government regulation of ticket pricing, although the federal government retains jurisdiction over aircraft safety, pilot training, and accident investigations (through the Federal Aviation Administration and the National Transportation Safety Board). The Transportation Security Administration provides security at airports.
With numerous airlines competing for traffic on the same intercity routes, ticket prices tend to be very competitive, resulting in low industry profit margins. This has led to frequent airline bankruptcies when ridership declines during economic recessions, jet fuel price increases, and other developments such as the September 11th terrorist attacks. Many airlines operate on a "hub and spoke" model. This system gives the predominant airline in a given airport a strong competitive position as it feeds passengers to and from the hub, maximizing the number of passengers on each flight. Examples of airline hubs include United Airlines in Chicago, Delta Air Lines in Atlanta, US Airways in Charlotte, American Airlines in Dallas.
Public airports are usually constructed and operated by local governments. The main exceptions are on military bases. Like highways and passenger rail, the federal government subsidizes air travel with $14 billion of federal funds going to airport operations in 2002.
Air cargo comprises a large number of daily flights in the United States and are operated by private parcel companies such as FedEx and United Parcel Service. These organizations operate some of the largest fleets in the world. Most air cargo moved by these organizations is time sensitive overnight and 2nd day parcels. The U.S. Postal Service also moves much of its letters and time sensitive parcels via air, but on regularly scheduled passenger flights. At one time the U.S. Mail charged a premium for letters sent by airmail, but no longer does so except for overnight express mail.
Further information: List of airlines of the United States and List of airports in the United States

Ranking of Major Airports by Lowest
On-Time Arrival Performance (2007)
Airport % on time
LaGuardia 58.48
Newark 59.45
JFK 62.84
Chicago O'Hare 65.88
Philadelphia 66.54
Boston Logan 69.68
San Francisco 69.75
Miami 70.99
Charlotte Douglas 71.30
Seattle-Tacoma 71.43
Largest 32 airports average 73.03
Airline delays have been the subject of some controversy, prompting a GAO audit and Congressional debate in 2007-08.
Roughly one in four passengers experienced a passenger trip delay in 2007 and the average duration of delay experienced by these passengers was 1 hour 54 minutes. 24% of flights were delayed and 2% were cancelled entirely. Overall, passengers were delayed 320 million hours in 2007 with an estimated deadweight economic loss of up to $41 billion.
An average of 40% of passenger aircraft delays in the U.S. originated in the New York metropolitan area, some in the area and others due to cascading effects. One-third of aircraft in the national airspace system move through the New York area at some point during a typical day.
To deal with delays, takeoff and landing scheduling caps have been imposed on certain urban airports at various times since 1968, including Washington Reagan National, Chicago O'Hare, and the three New York airports. Other short-term measures have been taken, including minor procedural changes, use of military airspace on peak travel days, and appointment of a "New York Airspace Czar" (Director for the New York Area Program Integration Office). The New York/New Jersey/Philadelphia airspace is being "redesigned" incrementally, with completion estimated in 2012. The Bush Administration announced plans to auction some takeoff and landing slots at the New York airports, but plans were canceled by the Obama administration.
Longer-term solutions include increasing capacity by building more runways, and implementing the Next Generation Air Transportation System which would allow more direct flight paths.
[edit]Network statistics
Airports: 14,951 (2008 est.) 
Airports with paved runways:
Total: 5,146
Over 10,000 ft: (3,047 m): 190
8,000 ft (2,438 m) to 10,000 ft (3,047 m): 227
5,000 ft (1,524 m) to 8,000 ft (2,437 m): 1,464
3,000 ft (914 m) to 5,000 ft (1,523 m): 2,307
under 3,000 ft (914 m): 958 (1999 est.)
Airports with unpaved runways:
Total: 9,805
8,000 ft (2,438 m) to 10,000 ft (3,047 m): (2,437 m): 6
5,000 ft (1,524 m) to 8,000 ft (2,437 m): 156
3,000 ft (914 m) to 5,000 ft (1,523 m): 1,734
Under 3,000 ft (914 m): 7,909 (1999 est.)
Heliports: 146 (CIA, 2007 est.) 



Grand Central Terminal, New York City
Passenger trains were the dominant mode of transportation until the mid-twentieth century. The introduction of jet airplanes on major U.S. routes and the completion of the Interstate Highway system accelerated a decline in intercity rail passenger demand during the 1960s, resulting in the sharp curtailment of passenger service by private railroads. This led to the creation of National Railroad Passenger Corporation (branded as Amtrak) by the Federal Government in 1971 to maintain limited intercity rail passenger service in most parts of the country. Amtrak serves most major cities but, outside of the Northeast, often by only one or two trains per day. Amtrak does not serve several major destinations, including Las Vegas, Nevada and Phoenix, Arizona. More frequent service is available in regional corridors between certain major cities, particularly the Northeast Corridor between Washington, D.C., New York City and Boston, between New York City and Albany, around Chicago, and in parts of California and the Pacific Northwest.

High-speed rail in the United States
The U.S. makes extensive use of its rail system for freight. According to the Association of American Railroads: "U.S. freight railroads are the world's busiest, moving more freight than any rail system in any other country. In fact, U.S. railroads move more than four times as much freight as do all of Western Europe's freight railroads combined."
Nearly all railroad corridors (not including local transit rail systems) are owned by private companies that provide freight service. Amtrak pays these companies for the right to use the tracks for passenger service. There are approximately 150,000 mi (240,000 km) of mainline track in the United States — the world's longest national railroad network. See List of United States railroads
Freight rail transportation in Chicago is a major national bottleneck (about one-third of the nation's freight trains pass through the region), and the subject of a $1.5B infrastructure improvement project.

Railway links with adjacent countries
Canada - Yes. Amtrak connections run daily between New York City and Montreal, New York City and Toronto, and Seattle and Vancouver. Alaska is currently rail-accessible by train ferry from Bellingham, Washington and narrow gauge railroad from Whitehorse, Yukon Territory to Skagway. A proposed link to the Continental United States would link Alaska and Canada via the Yukon and British Columbia. The Canadian National Railway system includes the former Illinois Central route from Chicago via Memphis to New Orleans.
Mexico - Yes. Several private firms run touristic trains from near El Paso, Texas through Chihuahua, Chihuahua and the Copper Canyon to El Fuerte, Sinaloa. Such trains also run from Nogales, Sonora, but no US passenger trains run near Nogales, Arizona, on the other side of the border. Another touristic train runs occasional trains between Campo, California, and Tecate, Baja California.
Cuba - No. Since the United States embargo against Cuba, train ferry service from Florida and New Orleans to Havana ceased.
Russia - No. But proposed tunnel or bridge under or over Bering Straits to connect with Trans-Siberian Railway.
With few exceptions, the rail gauge is standard gauge 4 ft 8 1⁄2 in (1,435 mm). The White Pass and Yukon Route from Skagway, Alaska to Whitehorse, Yukon by way of Bennett, British Columbia is 3 ft (914 mm) gauge.

Mass transit

 Mass transit in the United States

30th Street Station, Philadelphia
The miles traveled by passenger vehicles in the United States fell by 3.6% in 2008, while the number of trips taken on mass transit increased by 4.0%. At least part of the drop in urban driving can be explained by the 4% increase in the use of public transportation.
Most medium-sized cities have some sort of local public transportation, usually a network of fixed bus routes. Larger cities tend to have metro rail systems (also known as heavy rail in the U.S.) and/or light rail systems for high-capacity passenger service within the urban area.

On June 26, 2008, the House passed the Saving Energy Through Public Transportation Act (H.R. 6052), which gives grants to mass transit authorities to lower fares for commuters pinched at the pump and expand transit services. The bill also:
Requires that all Federal agencies offer their employees transit pass transportation fringe benefits. Federal agencies within the National Capital Region have successful transit pass benefits programs.
Increases the Federal cost-share of grants for construction of additional parking facilities at the end of subway lines from 80 to 100% to cover an increase in the number of people taking mass transit.
Creates a pilot program for vanpool demonstration projects in urban and rural areas.
Increases federal help for local governments to purchase alternative fuel buses, locomotives and ferries from 90 to 100%.

Water transportation

Water transport is largely used for freight. Fishing and pleasure boats are numerous, and passenger service connects many of the nation's islands and remote coastal areas, crosses lakes, rivers, and harbors, and provides alternative access to Alaska which bypasses Canada. Several major seaports in the United States include New York to the east, Houston and New Orleans on the gulf coast, Los Angeles to the west. The interior of the U.S. also has major shipping channels, via the St. Lawrence Seaway and the Mississippi River system. Freight on the Mississippi River system is carried on barges pushed by approximately 8000 "towboats" and largely consists of bulk goods, such as petrochemicals, grain and cement.
Many US ports served by cruise ships. Popular destinations include the Caribbean, the Mexican Riviera, Hawaii and the Inside Passage to Alaska. Automobile ferries operate in many locations where bridges are impractical and in congested metropolitan areas, including New York City and San Francisco Bay.

The United States has 25,482 miles (41,009 km) of navigable inland channels (rivers and canals), exclusive of the Great Lakes. Out of this 12,006 miles (19,322 km) is used in commerce. About 24,150 km (15,000 mi) of the Mississippi River system are presently navigable, although not all is used for commerce. The Saint Lawrence Seaway of 2,342 miles (3,769 km), including the Saint Lawrence River of 1,900 miles (3,100 km), is shared with Canada.

Ports and harbors
Ports in the United States
United States ports and harbors include:
Anchorage, Alaska
Baltimore, Maryland
Boston, Massachusetts
Charleston, South Carolina
Chicago, Illinois
Duluth, Minnesota
Erie, Pennsylvania
Hampton Roads, Virginia
Honolulu, Hawaii
Houston, Texas
Jacksonville, Florida
Long Beach, California
Los Angeles, California
Miami, Florida
Mobile, Alabama
New Orleans, Louisiana
Newark-New York City
Philadelphia, Pennsylvania
Pittsburgh, Pennsylvania
Port Canaveral, Florida
Portland, Oregon
Providence, Rhode Island
Oakland, California
San Diego, California
Savannah, Georgia
Seattle, Washington
Tacoma, Washington
Tampa, Florida
Toledo, Ohio
Valdez, Alaska

Merchant marine
United States Merchant Marine.
Most US exports and imports are on foreign ships. The Jones Act bars foreign ships from US internal trade, thus creating this "Jones Act fleet". Deck officers and ship's engineers of US flagged ships are usually trained at one of the established maritime academies.


The federal military has a dedicated system of bases with runways, aircraft, watercraft, conventional cars and trucks, and armored and special-purpose vehicles. During times of war, it may commandeer private infrastructure and vehicles as authorized by Congress and the President.

Pipeline statistics

Petroleum products: 224,620 km
Natural gas: 548,665 km (2006) 


Parts of this article (those related to reauthorization) are outdated. Please update this article to reflect recent events or newly available information. Please see the talk page for more information. (May 2010)
Federal, state, and local tax revenues support upkeep of most roads, which are generally free to drivers. There are also some toll roads and toll bridges. Most other forms of transportation charge a fee for use as they are not given much, if any, tax support by Congress.
Government funding of transportation exists at many levels. Federal funding for highway, rail, bus, water, air, and other forms of transportation is allocated by Congress for several years at a time. The current authorization bill is the Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU), which runs from 2005 to 2009. A Congressionally chartered committee is considering future funding issues.
Though earmarks are often made for specific projects, the allocation of most federal dollars is controlled by metropolitan planning organizations (MPOs) and state governments. Usually "matching" funds are required from local sources. All projects have a sponsoring agency that will receive the funding from the various federal and local sources, and be responsible for implementing the project directly or through contracts. Large projects require a Major Investment Study and a both a Draft and a Final Environmental Impact Review. A patchwork of federal laws and accounts govern the allocation of federal transportation dollars, most of which is reserved for capital projects, not operating expenses. Some roads are federally designated as part of the National Highway System and get preferential funding as a result, but there are few federally maintained roads outside of Washington D.C. and national parks.
State governments are sovereign entities which use their powers of taxation both to match federal grants, and provide for local transportation needs. Different states have different systems for dividing responsibility for funding and maintaining road and transit networks between the state department of transportation, counties, municipalities, and other entities. Typically cities or counties are responsible for local roads, financed with block grants and local property taxes, and the state is responsible for major roads that receive state and federal designations. Many mass transit agencies are quasi-independent and subsidized branches of a state, county, or city government.

Economic impact

According to the U.S. Department of Transportation (DOT): "Transportation’s vital importance to the U.S. economy is underscored by the fact that more than $1 out of every $10 produced in the U.S. gross domestic product is related to transportation activity. This includes all aspects of transportation, including the movement of goods and the purchase of all transportation-related products and services as well as the movement of people."  Employment in the transportation and material moving industry accounted for 7.4% of all employment, and was the 5th largest employment group in the United States.
The US invests 0.6% of its GDP on transportation annually.

Environmental impacts

Two-thirds of U.S. oil consumption is due to the transportation sector. The “Energy Independence and Security Act of 2007” has a significant impact on U.S. Energy Policy.The US — an important export country for food stocks — will convert 18% of its grain output to ethanol in 2008. Across the US, 25% of the whole corn crop went to ethanol in 2007. The percentage of corn going to biofuel is expected to go up.In 2006, U.S. Senators introduced the BioFuels Security Act.


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