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C: Centigrade (49CFR171)

C&P: Conditions and Performance (Report to Congress) (FHWA12)

C2H5OH: Ethanol (DOE6)

CA: Cab To Axle (GSA2)

CA: Conflict Alert (FAA19)

CA: Contract Air (MTMC1)

CA/MSAW: Conflict Alert/Minimum Safe Altitude Warning (FAA19)

CAA: Civil Aviation Authority (FAA17)

CAA: Clean Air Act (VDOT)

CAAA: Clean Air Act Amendments of 1990 (BTS2)

Cab: That portion of the superstructure designed to be occupied by the crew operating the locomotive. (49CFR229)

Cab: The compartment of a locomotive from which the propelling power and power brakes of the train are manually controlled. (49CFR236)

Cab: Portion of truck where the driver sits; tractor. The passenger compartment of a vehicle. (ATA1)

CAB: Civil Aeronautics Board (FAA2)

Cab Beside Engine: The cab is located to left or right side of the engine. (BOC3)

Cab Forward of the Engine: The engine is directly behind the cab. (BOC3)

Cab Over: A vehicle with a substantial part of its engine located under the cab. Also known as snubnose. (ATA1)

Cab Signal: A signal located in engineman's compartment or cab, indicating a condition affecting the movement of a train and used in conjunction with interlocking signals and in conjunction with or in lieu of block signals. (49CFR236)

Cab-Over-Engine (COE): A truck or truck-tractor, having all, or the front portion, of the engine under the cab. (49CFR399)

Cab-Over-Engine (COE) High Profile: A COE having the door sill step above the height of the front tires. (49CFR399)

Cab-To-Axle Dimension (CA): The distance from the back of a truck cab to the center line of the rear axle. For trucks with tandem rear axles, the CA dimension is given midway between the two rear axles. (GSA2)

Cabin Deck: The second deck on most river steamboats. It was lined with staterooms surrounding the main cabin. It was also called the Boiler deck even though the boilers were on the cargo deck below. (TNDOT1)

Cabin Motorboat: Motorboats with a cabin which can be completely closed by means of doors or hatches. Large motorboats with cabins, even though referred to as yachts, are considered to be cabin motorboats. (USCG2)

Cable Car: An electric railway operating in mixed street traffic with unpowered, individually-controlled transit vehicles propelled by moving cables located below the street surface and powered by engines or motors at a central location not on board the vehicle. (APTA1)

Cable Cars: Streetcar type of passenger vehicles operating by means of an attachment to a moving cable located below the street surface and powered by engines or motors at a central location not on board the vehicles. (FTA1)

Cableway: A conveyor system in which carrier units run on wire cables strung between supports. (DOI4)

Caboose: A car in a freight train intended to provide transportation for crew members. (49CFR223)

Cabotage: A law which requires coastal and intercoastal traffic to be carried by vessels belonging to the country owning the coast. (USTTA1)

Cackle Crate: Truck that hauls live poultry. (ATA1)

CAD: Computer-Aided Dispatch (FTA4)

CADLAS: Computer Assisted Depreciation and Life Analysis System (BTS7)

CAEG: Computer Aided Engineering Graphics (FAA17) (FAA19)

CAFE: Corporate Average Fuel Economy (BTS2) (NHTSA5)

Calculated Landing Time: A term that may be used in place of tentative or actual calculated landing time, whichever applies. (FAA4)

Calendar Year: The period of time between January 1 and December 31 of any given year. (DOE6)

Calibrated Airspeed: The indicated airspeed of an aircraft, corrected for position and instrument error. Calibrated airspeed is equal to true airspeed in standard atmosphere at sea level. (14CFR1)

Call For Release: Wherein the overlying Air Route Traffic Control Center (ARTCC) requires a terminal facility to initiate verbal coordination to secure Air Route Traffic Control Center (ARTCC) approval for release of a departure into the en route environment. (FAA4)

Call Up: Initial voice contact between a facility and an aircraft, using the identification of the unit being called and the unit initiating the call. (FAA4)

CALTRANS: California Department of Transportation (BTS2)

Camel Back Body: Truck body with floor curving downward at the rear. (ATA1)

Camp Car: Any on-track vehicle, including outfit, camp, or bunk cars or modular homes mounted on flat cars used to house rail employees. It does not include wreck trains. (49CFR218)

Campaign: A Defect/Noncompliance Campaign Program carried out by the manufacturer and initiated under 46 U.S.C. 4310. Starts as a case. A campaign may involve only one boat. (USCG1)

Canadian Minimum Navigation Performance Specification Airspace: That portion of Canadian domestic airspace within which Minimum Performance Specifications Airspace (MNPSA) separation may be applied. (FAA4)

Canal/Ditch: (See also Aqueduct) An artificial open waterway constructed to transport water, to irrigate or drain land, to connect two or more bodies of water, or to serve as a waterway for watercraft. (DOI3)

Canard: The forward wing of a canard configuration and may be a fixed, movable, or variable geometry surface, with or without control surfaces. (14CFR1)

Canard Configuration: A configuration in which the span of the forward wing is substantially less than that of the main wing. (14CFR1)

Cancellation of Insurance: The withdrawal of insurance coverage by either the insurer or the insured. (49CFR387)

Capacity Per Aircraft Mile: The average total passenger/cargo carrying capacity (tons) offered for sale per aircraft in revenue services, derived by dividing the overall available ton-miles by the total aircraft miles flown in revenue services. (BTS5)

Cape: A relatively extensive land area jutting into a water body, which prominently marks a change in or notably interrupts the coastal trend of that water body. (DOI4)

Capital Employee: An employee involved with construction or capital procurement and who has no involvement with operation of the transit system. (APTA1)

Capital Gains or Losses, Operating Property: Gains or losses on retirements of operating property and equipment, flight equipment expendable parts or miscellaneous materials and supplies when sold or otherwise retired in connection with a general retirement program as opposed to incidental sales performed as a service to others. (BTS4)

Capital Gains or Losses, Other: Gains or losses on no operating assets, investments in other than marketable equity securities, and troubled debt restructuring. (BTS4)

Capital Program Funds: Financial assistance from the Capital Program of 49 U.S.C. (formerly Section 3). This program enables the Secretary of Transportation to make discretionary capital grants and loans to finance public transportation projects divided among fixed guideway (rail) modernization; construction of new fixed guideway systems and extensions to fixed guideway systems; and, replacement, rehabilitation, and purchase of buses and rented equipment, and construction of bus-related facilities. (FTA1)

Capitalized Interest: Adjustment to income for interest capitalized on funds actually committed as equipment purchase deposits or actually used to finance the construction or acquisition of operating property. (BTS4)

CAPOS: Cargo Performance Overview System (BTS7)

Capsizing: Overturning of a vessel. The bottom must be uppermost, except on the case of a sailboat, which lies on its side. (USCG2)

Captain of the Port (COTP): The officer of the Coast Guard, under the command of a District Commander, designated by the Commandant for the purpose of giving immediate direction to Coast Guard law enforcement activities within an assigned area. The term Captain of the Port includes an authorized representative of the Captain of the Port. (49CFR171)

Captive Imports: Products produced overseas specifically for domestic manufacturers. (DOE6)

Car: See also Automobile, Minivan, Motor Vehicle, Taxi, Vehicle.

Car: 1) Any unit of on-track equipment designed to be hauled by locomotives; 2) Any unit of on-track work equipment such as a track motorcar, highway-rail vehicle, push car, crane, ballast tamping machine, etc; 3) A railway car designed to carry freight, railroad personnel, or passengers. This includes boxcars, covered hopper cars, flatcars, refrigerator cars, gondola cars, hopper cars, tank cars, cabooses, stock cars, ventilation cars, and special cars. It also includes on-track maintenance equipment. (FRA2) (FRA3) (FRA4)

CAR: Caribbean Region (USTTA1)

Car Capacity: Load limitation of a freight car in terms of volume or weight. (AAR1)

Car Shop Repair Track Area: One or more tracks within an area in which the testing, servicing, repair, inspection, or rebuilding of railroad rolling equipment is under the exclusive control of mechanical department personnel. (49CFR218)

Car-Mile: The movement of a car a distance of one mile. (AAR1)

CARAT: Congestion Avoidance and Reduction for Automobiles and Trucks (FHWA14)

CARB: California Air Resources Board (VDOT)

Carbon Dioxide (CO2): A fluid consisting of more than 90 percent carbon dioxide molecules compressed to a supercritical state. (49CFR195)

Carbon Dioxide (CO2): A colorless, odorless, non-poisonous gas that is a normal part of the ambient air. Carbon dioxide is a product of fossil fuel combustion. (DOE6)

Carbon Monoxide (CO): A colorless, odorless, highly toxic gas that is a normal by-product of incomplete fossil fuel combustion. Carbon monoxide, one of the major air pollutants, can be harmful in small amounts if breathed over a certain period of time. (DOE6)

Carburetor: (See also Diesel Fuel System, Fuel Injection) A fuel delivery device for producing a proper mixture of gasoline vapor and air, and delivering it to the intake manifold of an internal combustion engine. Gasoline is gravity fed from a reservoir bowl into a throttle bore, where it is allowed to evaporate into the stream of air being inducted by the engine. The fuel efficiency of carburetors is more temperature dependent than fuel injection systems. (DOE4)

CARD: Crash Avoidance Research Data File (NHTSA2)

Cardinal Altitude: (See also Flight Level) "Odd" or "Even" thousand-foot altitudes or flight levels; e.g., 5,000, 6,000, 7,000, FL 250, FL 260, FL 270. (FAA4)

CARF: Central Altitude Reservation Function (FAA4) (FAA17) (FAA8)

Carfloat: A vessel that operates on a short run on an irregular basis and serves one or more points in a port area as an extension of a rail line or highway over water, and does not operate in ocean, coastwise, or ferry service. (49CFR171)

Carfloat: A barge equipped with tracks on which up to about 12 railroad cars are moved in harbors or inland waterways. (MARAD2)

Cargo: See also Commodity, Freight, Goods, Product.

Cargo: 1) Freight carried by a barge. 2) Property, mail and express; other than passengers transported. (BTS6) (TNDOT1)

Cargo Aircraft: An aircraft that is used to transport cargo and is not engaged in carrying passengers. The terms cargo aircraft only, cargo-only aircraft and cargo aircraft have the same meaning. (49CFR171)

Cargo Crane: A crane especially adapted to the transferring of cargo between a vessel's hold and a wharf. (TNDOT1)

Cargo Insurance and Freight (CIF): Refers to cargos for which the seller pays for the transportation and insurance up to the port of destination. (DOE5)

Cargo Tank: A bulk packaging which: 1) Is a tank intended primarily for the carriage of liquids or gases and includes appurtenances, reinforcements, fittings, and closures; 2) Is permanently attached to or forms a part of a motor vehicle, or is not permanently attached to a motor vehicle but which, by reason of its size. construction or attachment to a motor vehicle is loaded or unloaded without being removed from the motor vehicle; and 3) Is not fabricated under a specification for cylinders, portable tanks, tank cars, or multi-unit tank car tanks. (49CFR171)

Cargo Tank Motor Vehicle: A motor vehicle with one or more cargo tanks permanently attached to or forming an integral part of the motor vehicle. (49CFR171)

Cargo Ton-Miles: One ton of cargo transported one mile. (BTS6)

Cargo Tonnes: The tonnes of cargo carried by a vessel on each or any transit. (SLSDC1)

Cargo Transfer System: A component, or system of components functioning as a unit, used exclusively for transferring hazardous fluids in bulk between a tank car, tank truck, or marine vessel and a storage tank. (49CFR193)

Cargo Vessel: 1) Any vessel other than a passenger vessel; 2) any ferry being operated under authority of a change of character certificate issued by a Coast Guard Officer-in-Charge, Marine Inspection. (49CFR171)

Cargo-Carrying Unit: Any portion of a commercial motor vehicle (CMV) combination (other than a truck tractor) used for the carrying of cargo, including a trailer, semitrailer, or the cargo-carrying section of a single-unit truck. (23CFR658)

Carload: Shipment of freight required to fill a rail car. (ATA2)

Carload: A shipment of not less than 10,000 pounds of one commodity from one consignor to one consignee. (AAR1)

Carpool: An arrangement where two or more people share the use and cost of privately owned automobiles in traveling to and from pre-arranged destinations together. (ATPA1)

Carried Carload: Any carload which travels on a particular railroad. (AAR1)

Carrier: A person engaged in the transportation of passengers or property by land or water, as a common, contract, or private carrier; or civil aircraft. (49CFR171)

Carrier Group: A grouping of certificated air carriers determined by annual operating revenues as shown below: Majors $1 billion +; Nationals $100 million to $1 billion; Large regionals $20 million to $99.9 million; Medium regionals 0 to $19.9 million or that operate aircraft with 60 or less seats or maximum payload capacity of 18,000 lbs. (FAA2) (FAA15)

Carrier Liability: A common carrier is liable for all loss, damage, and delay with the exception of act of God, act of a public enemy, act of a public authority, act of the shipper, and the inherent nature of the goods. Carrier liability is specified in the terms of the bill of lading. (MARAD1)

Carrier Type: "For-hire", private or "other." (FHWA2) (FHWA4)

Cartage: Usually refers to intra-city hauling on drays or trucks. (MARAD2)

CAS: Calibrated Airspeed (14CFR1)

CASA: Controller Automated Spacing Aid (FAA17)

Case: An investigation of a particular boating problem or incident to determine if there is a substantial risk to the public or violation of the regulations. A case may become a campaign. (USCG1)

Case: A single incident of distress to which one or more Coast Guard units respond. (USCG3)