Air carrier: Certificated
provider of scheduled and nonscheduled services.
fueled vehicle: A vehicle designed to operate on an alternative fuel (e.g.,
compressed natural gas, propane, electricity). The vehicle can be either a
dedicated vehicle designed to operate exclusively on alternative fuel or a
non-dedicated vehicle designed to operate on alternative fuel and/or
dollars: A method of adjusting to real dollar amounts to account for both
changes in price-levels and the composition of output over time. This is
completed by using a chain-weighted
type index, or average weights in successive time periods, to
get a comparable time series of data.
railroad: Railroads earning adjusted annual operating revenues for three
consecutive years of $250,000,000 or more, based on 1991 dollars with an
adjustment factor applied to subsequent years.
rail: Urban/suburban passenger train service for short-distance travel
between a central city and adjacent suburbs run on tracks of a traditional
railroad system. Does not include heavy or light rail transit service.
transit: A nonfixed-route, nonfixed-schedule form of transportation that
operates in response to calls from passengers or their agents to the transit
operator or dispatcher.
route-miles: The sum of the mileage in each direction over
which transit vehicles travel while in revenue service.
Enplanements: Total number of revenue passengers
For-hire: Refers to a
vehicle operated on behalf of or by a company that provides services to
external customers for a fee. It is distinguished from private transportation
services, in which a firm transports its own freight and does not offer its
transportation services to other shippers.
aviation: Civil aviation operations other than those air carriers holding a
Certificate of Public Convenience and Necessity. Types of aircraft used in
general aviation range from corporate, multi–engine jets piloted by a
professional crew to amateur-built, single-engine, piston-driven, acrobatic
Product: The total value of goods and services produced by labor and
property located in the United States. As long as the labor and property are
located in the United States, the suppliers may be either U.S. residents or
residents of foreign countries.
transit: High-speed transit rail operated on rights-of-way that exclude all
other vehicles and pedestrians.
vehicle: Hybrid electric vehicles combine features of internal combustion
engines and electric motors. Unlike 100% electric vehicles, hybrid vehicles do
not need to be plugged into an external source of electricity to be recharged.
Most hybrid vehicles operate on gasoline.
Index (IRI): A scale for
pavement roughness based on the simulated response of a generic motor vehicle
to the roughness in a single wheel path of the road surface.
Lane-miles: One mile of one lane of road.
Light duty vehicle: Includes passenger cars,
light trucks, vans, pickup trucks, and sport/utility vehicles regardless of
Light-rail transit: Urban
transit rail operated on a reserved right-of-way that may be crossed by roads
used by motor vehicles and pedestrians.
dollars: A market value that does not take inflation into account and
reflects prices and quantities that is current during the period being
vessels: Includes dry cargo, tank barges, and railroad car floats that
operate in U.S. ports and waterways.
vessels: Includes U.S. flag, privately-owned merchant fleet of oceangoing,
self-propelled, cargo-carrying vessels of 1,000 gross tons or greater.
particles formed by partial oxidation and reduction of hydrocarbon fuel. Also
included are trace quantities of metal oxides and nitrides originating from
engine wear, component degradation, and inorganic fuel additives.
passenger transported one mile. For example, one vehicle traveling 3 miles
carrying 5 passengers generates 15 passenger miles.
communication: Involves contacting the source for data if not publicly
hybrid electric vehicles: Plug-in hybrids use the electric battery as
the primary energy source by relying on battery power for propulsion for a
limited range (15-40 miles) before switching to internal combustion propulsion
(thus reducing gasoline consumption).
designated by the Federal Aviation Administration to relieve congestion at
commercial service airports and to provide improved general aviation access to
the overall community.
Measures the real differences in data trends by adjusting for seasonal factors
such as the change in the number of days, weekends, holidays, or other seasonal
activity in a month such as vacation travel.
Self-propelled vessels: Includes
dry cargo vessels, tankers, and offshore supply vessels, tugboats, pushboats,
and passenger vessels, such as excursion/sightseeing boats, combination
passenger and dry cargo vessels, and ferries.
ton: A unit of weight equal to 2,000 pounds.
deficient: Structural deficiencies are characterized by deteriorated
conditions of significant bridge elements and reduced load-carrying capacity.
Real Dollars: A method of adjusting nominal
dollars to account for price level changes over time. It reflects purchasing power in a given
Tg CO2 Eq.: Teragrams of carbon dioxide equivalent, a
metric measure used to compare the emissions from various greenhouse gases
based on their global warming potential.
Ton-mile: A unit of
measure equal to movement of one ton over one mile.
measure indicating the relative change in the volume of services over time
performed by the for-hire transportation sector. Change is shown relative to a
base year, which is given a value of 100. The TSI covers the activities of
for-hire freight carriers, for-hire passenger carriers, and a combination of
the two. See www.bts.gov
Transportation Services Index Combined:
The combined Transportation Services
Index (TSI) includes available data on freight traffic, as well as passenger
travel, that have been weighted to yield a monthly measure of transportation
Transportation Services Index Freight: The freight TSI measures
the output of the for-hire freight transportation industry and consists of data
from for-hire trucking, rail, inland waterways, pipelines and air freight.
Transportation Services Index Passenger: The passenger TSI includes
local transit, intercity passenger rail, and passenger air transportation, that
have been weighted to yield a monthly measure of transportation services
passenger trip: The number
of passengers who board public transportation vehicles. Passengers are counted
each time they board vehicles no matter how many vehicles they use to travel
from their origin to their destination.
Vehicle-mile: One vehicle
traveling one mile.