FAQs

Trucking Term Glossary

Browse our trucking term glossary by letter:

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A


ABS (Antilock Braking System)
Computer, sensors and solenoid valves which together monitor wheel speed and modulate braking force if wheel lockup is sensed during braking. Helps the driver retain control of the vehicle during heavy braking on slippery roads.

AFV (Alternative Fueled Vehicle)
Vehicle powered by a fuel other than gasoline or diesel.

Air Ride Suspension
Suspension which supports the load on air-filled rubber bags rather than steel springs. Compressed air is supplied by the same engine-driven air compressor and reservoir tanks which provide air to the air brake system.

ATC (Automatic Traction Control)
Usually an optional feature based on ABS, it prevents spinning of the drive wheels under power on slippery surfaces by braking individual wheels and/or reducing engine throttle. Also called ASR, an acronym sometimes loosely translated from the German as anti-spin regulation.

ATV (All Terrain Vehicle)
Vehicle designed for any type of terrain.

AVI (Automatic Vehicle Identification)
System combining an on-board transponder with roadside receivers to automate identification of vehicles. Uses include electronic toll collection and stolen vehicle detection. (see IVHS)

AVL (Automated Vehicle Location)
Class of technologies designed to locate vehicles for fleet management purposes and for stolen vehicle recovery. Infrastructure can be land-based radio towers or satellites. (see IVHS)

Axle
Structural component to which wheels, brakes and suspension are attached.

- Drive axles are those with powered wheels.
- Front axle is usually called the steer axle.
- Pusher axles are unpowered and go ahead of drive axles.
- Rear axles may be drive, tag or pusher types.
- Tag axles are unpowered and go behind drive axles.

B         Top of page



BBC
Distance from a truck's front bumper to the back of its cab.

Bill of Lading
Itemized list of goods contained in a shipment.

Blind Spot
Areas around a commercial vehicle that are not visible to the driver either through the windshield, side windows or mirrors.

Bobtail
Tractor operating without a trailer.

Bogie (also spelled bogey).
Assembly of two or more axles, usually a pair in tandem.

Brake Horsepower (bhp)
Engine horsepower rating as determined by brake dynamometer testing. (see Horsepower)

Bridge Formula
A bridge protection formula used by federal and state governments to regulate the amount of weight that can be put on each of a vehicle's axles, and how far apart the axles (or groups of axles) must be to legally carry a given weight.

Bunk
See Sleeper.

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Cabover (Cab-Over-Engine, COE)
Truck or tractor design in which the cab sits over the engine on the chassis.

Cargo Weight
Combined weight of all loads, gear and supplies on a vehicle.

Cartage Company
Company that provides local (within a town, city or municipality) pick-up and delivery.

Cast Spoke Wheel
Wheel with five or six spokes originating from a center hub. The spoked portion, usually made of cast steel, is bolted to a multiple-piece steel rim (see Demountable Rim; Disc Wheel).

CB (Citizens Band Radio)
Two-way radio for which no license is required by the Federal Communications Commission (FCC). Long beyond its heyday in the '70s, CB is still used by truckers and motorists for everything from traffic condition reports to emergency calls to idle chatter.

CDL (Commercial Driver's License)
License which authorizes an individual to operate commercial motor vehicles and buses over 26,000 pounds gross vehicle weight. For operators of freight-hauling trucks, the maximum size which may be driven without a CDL is Class 6 (maximum 26,000 pounds gross vehicle weight).

CE (CF, LP)
Distance from back of a truck's cab to the end of its frame.

CFC
Chlorofluorocarbon.

CG (Center of Gravity)
Weight center or balance point of an object, such as a truck body. Calculated to help determine optimum placement of truck bodies on chassis. 

Chassis Weight (Curb Weight, Tare Weight)
Weight of the empty truck, without occupants or load.

CNG
Compressed natural gas.

COE
See Cabover.

COFC (Container On Flat Car)
Method of moving shipping containers which involves transporting them on railroad flat cars.

Common Carrier
Freight transportation company which serves the general public. May be regular route service (over designated highways on a regular basis) or irregular route (between various points on an unscheduled basis).

Compensated Intracorporate Hauling
Freight transportation service provided by one company for a sister company.

Container (Shipping Container)
Standard-sized rectangular box used to transport freight by ship, rail and highway. International shipping containers are 20 or 40 feet long, conform to International Standards Organization (ISO) standards and are designed to fit in ships' holds. Containers are transported on public roads atop a container chassis towed by a tractor. Domestic containers, up to 53 feet long and of lighter construction, are designed for rail and highway use only.

Container Chassis
Single-purpose semitrailer designed to carry a shipping container.

Contract Carrier
Company that transports freight under contract with one or a limited number of shippers.

Converter Dolly (Dolly)
Auxiliary axle assembly equipped with a fifth wheel (coupling device), towed by a semitrailer and supporting the front of, and towing, another semitrailer.

Cube (Cubic Capacity)
Interior volume of a truck body, semitrailer or trailer, measured in cubic feet.

Curb Weight
See Chassis Weight.

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Dead-Heading
Operating a truck without cargo.

Demountable Rim
Multi-piece steel wheel rim assembly which is bolted to a spoke hub. Demountable rims are still in use, though they have been replaced in many applications by the simpler disc wheel. (see Cast Spoke Wheel)

Disc Wheel
Single-piece rim/wheel assembly of stamped and welded steel or forged aluminum, anchored by 8 or 10 nuts to a hub. A "Budd wheel" is a ten-hole, stud-piloted disc wheel; a design originated by the Budd Corporation.

Displacement (Piston Displacement)
Sum of the volumes swept by an engine's pistons as they travel up and down in their cylinders. Based upon bore (diameter of cylinder) and stroke (distance traveled by piston). Expressed in liters or cubic inches.

Dolly
See Converter Dolly.

DOT
Department of Transportation.

Doubles (Twins, Twin Trailers)

Combination of a tractor and two semitrailers connected in tandem by a converter dolly. (see Converter Dolly; Pintle Hook)

Driveline
All the components which together transmit power from the transmission to the drive axle(s). These consist of at least one driveshaft (propeller shaft) with a universal joint at each end.

Drivetrain (Powertrain)
All the components, excluding engine, which transmit the engine's power to the rear wheels: clutch, transmission, driveline and drive axle(s). (See Powertrain)

DRL (Daytime Running Lights)
System that automatically turns on a vehicle's low beam headlights when the parking brake is released and the ignition is on.

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EDI (Electronic Data Interchange)
The business-to-business interconnection of computers for the rapid exchange of a wide variety of documents, from bills of lading to build tickets at auto plants.

Escape Ramp
See Runaway Truck Ramp.

Escrow
Money placed with a third person with direction to use it for a specific purpose, usually payment of taxes and insurance.

Exempt Carrier
Company which transports commodities exempted from Interstate Commerce Commission (ICC) economic regulation.

EV (Electric Vehicle)
Vehicle powered by electric motor(s) rather than by an internal combustion engine. Most common source of electricity is chemical storage batteries.

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Fifth Wheel
Coupling device attached to a tractor or dolly which supports the front of a semitrailer and locks it to the tractor or dolly. The fifth wheel's center is designed to accept a trailer's kingpin, around which the trailer and tractor or dolly pivot in turns.

Fixed Tandem
Assembly of two axles and suspension that is attached to the chassis in one place, and cannot be moved fore and aft. (see Sliding Tandem)

For-Hire Carrier
Company in the business of transporting freight belonging to others (see Private Carrier).

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GAWR (Gross Axle Weight Rating)
Maximum weight an axle is rated to carry by the manufacturer. Includes both the weight of the axle and the portion of a vehicle's weight carried by the axle.

GCW (Gross Combination Weight)
Total weight of a loaded combination vehicle, such as a tractor-semitrailer or truck and full trailer(s).

Geared Speed
Calculated vehicle speed at the engine's governed rpm in each transmission gear, or (commonly) in top gear.

Gear Ratio
Number, usually expressed as a decimal fraction, representing how many turns of the input shaft cause exactly one revolution of the output shaft. Applies to transmissions, power takeoffs, power dividers and rear axles. Example: If 2.5 revolutions of an input shaft cause one revolution of the output shaft, the gear ratio is 2.5:1.

Grade
Steepness of a grade, expressed as a percentage. Example: A vehicle climbing a 5% grade rises 5 feet for every 100 feet of forward travel.

Gradeability
Vehicle's ability to climb a grade at a given speed. Example: A truck with a gradeability of 5% at 60 mph can maintain 60 mph on a grade with a rise of 5%.

GVW (Gross Vehicle Weight)
Total weight of a vehicle and everything aboard, including its load.

GVWR (Gross Vehicle Weight Rating)
Total weight a vehicle is rated to carry by the manufacturer, including its own weight and the weight of its load.

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Hazmat
Hazardous materials, as classified by the U.S. Environmental Protection Agency (EPA). Transport of hazardous materials is strictly regulated by the U.S. Department of Transportation.

Headache Rack
Heavy protective barrier mounted behind the tractor's cab. Designed to prevent "headaches" caused by load shifting forward from the trailer and crushing the cab.

HCFC
Hydrochlorofluorocarbon.

Horsepower (hp)
Measure of power (the amount of work that can be done over a given amount of time). One horsepower is defined as 33,000 foot-pounds of work in one minute. Example: Lifting 33,000 pounds one foot in one minute, or lifting 3300 pounds ten feet in one minute.

Horsepower, Gross Laboratory
Tested horsepower of a "bare" engine without fan, water pump, alternator, exhaust system or any other accessories.

Horsepower, SAE Net
Horsepower capability of an engine with full accessories and exhaust system. Test procedures per standards of Society of Automotive Engineers (SAE).

Hours-Of-Service
U.S. Department of Transportation safety regulations which govern the hours of service of commercial vehicle drivers engaged in interstate trucking operations.

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Independent Trucker
See Owner Operator.

ITS (Intelligent Transportation Systems)
Formerly called IVHS.

IVHS (Intelligent Vehicle Highway Systems)

Blanket term for a wide array of technologies, including electronic sensors, computer hardware and software and radio communications. The purpose of IVHS is to increase efficiency of use of existing highways, reducing travel time, fuel consumption, air pollution and accidents. There are five functional areas:

- Advanced Public Transportation Systems (APTS)
- Advance Traffic Management Systems (ATMS)
- Advance Traveler Information Systems (ATIS)
- Advanced Vehicle Control Systems (AVCS)
- Commercial Vehicle Operations (CVO)

A more recently coined term, Intelligent Transportation Systems (ITS), encompasses both IVHS and modes of transportation other than highway, such as rail. (see AVI, AVL, WIM)

J         Top of page


Jackknife
To place the trailer at a very sharp angle to the tractor.

Jake Brake
See Retarder.

JIT (Just-In-Time)
Manufacturing system which depends on frequent, small deliveries of parts and supplies to keep on-site inventory to a minimum.

K         Top of page


Kingpin (axle)
Pin around which a steer axle's wheels pivot.

Kingpin (trailer)
Anchor pin at the center of a semitrailer's upper coupler which is captured by the locking jaws of a tractor's fifth wheel to attach the tractor to the semitrailer.

L         Top of page


Landing Gear
Retracting legs which support the front of a semitrailer when it is not coupled to a tractor.

LCV (Long Combination Vehicle)
In general, vehicles longer than a standard doubles rig (tractor and two 28-foot semitrailers). Examples of LCVs which are permitted in some U.S. western states and eastern toll roads: Twin 48-foot trailers; triple 28-foot trailers.

Lessee
Company or individual which leases vehicles.

Lessor
Company which leases vehicles.

Lift Axle
Extra, unpowered axle needed only when the vehicle is loaded, allowing it to meet federal and state vehicle weight standards. The lift axle is mounted to an air spring suspension that raises the axle when it is not required.

LPG
Liquefied Petroleum Gas, e.g., Propane Butane.

Load Range (Tires)

Letter code system for the weight carrying capacity of tires. Comparable ply ratings are shown below. LR PR LR PR
A .... 2 E .... 10
B .... 4 F .... 12
C .... 6 G .... 14
D .... 8 H .... 16
(LR = Load Range PR = Ply Rating)

Logbook
Book carried by truck drivers in which they record their hours of service and duty status for each 24-hour period. Required in interstate commercial trucking by the U.S. Department of Transportation.

Lowboy
Open flat-bed trailer with a deck height very low to the ground, used to haul construction equipment or bulky or heavy loads.

LTL (Less-Than-Truckload)
A quantity of freight less than that required for the application of a truckload (TL) rate; usually less than 10,000 pounds. (see TL)

LTL Carrier
Trucking company which consolidates less-than-truckload cargo for multiple destinations on one vehicle. (see TL Carrier)

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O         Top of page


On-Board Computer
See Trip Recorder.

Operating Authority
“Operating authority” is the term used by transportation regulatory agencies to describe a grant of legal permission by a federal or state government to engage in for-hire interstate (state-to-state) or intrastate (within a state) transportation by motor vehicle. Essentially, it is a business license. Much like a plumber needs to be licensed and insured, so too does a trucker or mover (also called a motor carrier). In certain areas called “Commercial Zones” no trucking license is needed if you operate solely within the zone. However, if you are unlicensed and you transport regulated commodities where one or both points are outside the zone, you run the risk of being issued notices of violation and having to pay substantial civil penalties.

Authority is broken down by type (“common”, “contract” and “broker”) and commodity (“property except household goods”, “household goods” and “passenger”). “Common” carriers are essentially companies that are open to the public for hire. “Contract” carriers only serve businesses with whom they have -- you guessed it -- a contract! “Brokers” merely arrange for transportation but don’t actually take possession of a shipment. General commodities are classified as “Property Except Household Goods”, while the personal effects of a homeowner are considered “Household Goods”. Most carriers that operate bus companies or van services are required to have “Passenger” authority. There is also 'freight forwarder' authority. Freight Forwarders are essentially travel agents for freight who arrange for motor carrier, ocean and/or air transportation to get freight from Point A to Point B.

Overdrive
Gearing in which less than one revolution of a transmission's input shaft causes one turn of the output shaft. The purpose of overdrive is to reduce engine rpm in high gear for better fuel economy. Example: A transmission with an overdrive top gear has a ratio of 0.70 to one. Turning the input shaft 0.7 revolutions causes 1.0 revolution of the output shaft.

Owner-Operator
Trucker who owns and operates his own truck(s).

P         Top of page


P&D
Pickup and delivery.

Payload
Weight of the cargo being hauled.

Peddle Run
Truck route with frequent delivery stops.

Pigtail
Cable used to transmit electrical power from the tractor to the trailer. So named because it is coiled like a pig's tail.

Piggyback
Semitrailer built with reinforcements to withstand transport by a railroad flatcar. (see TOFC)

Pintle Hook
Coupling device used in double trailer, triple trailer and truck-trailer combinations. It has a curved, fixed towing horn and an upper latch that opens to accept the drawbar eye of a trailer or dolly.

Piston Displacement
See Displacement.

Ply Rating (PR)
Relative measure of tire casing strength. (see Load Range)

Powertrain (Drivetrain)
All the components, including engine, which transmit the engine's power to the rear wheels: clutch, transmission, driveline and drive axle(s).

Private Carrier
Business which operates trucks primarily for the purpose of transporting its own products and raw materials. The principle business activity of a private carrier is not transportation. (see For-Hire Carrier)

Process Agent
When you apply for Interstate Authority, you are required to have a process agent on file for all 50 states. A process agent is merely someone with a bona fide place of business in the state that will accept legal documents on your behalf and forward them to you. When you apply for authority with DOTAuthority.com, we arrange for our partner process agent service company to make your required BOC-3 filing at no additional charge to you!

PSI (Pounds Per Square Inch)
In trucking, unit of measurement for tire air pressure, air brake system pressure and turbocharger boost.

PTO (Power Takeoff)
Device used to transmit engine power to auxiliary equipment. A PTO often drives a hydraulic pump, which can power a dump body, concrete mixer or refuse packer. Some designs mount to a standard opening on the transmission, while others attach at the front or rear of the engine.

Pull Trailer
Short, full trailer (supported by axles front and rear) with an extended tongue.

Pup Trailer
Short semitrailer, usually between 26 and 32 feet long, with a single axle.

Pusher Axle
See Axle.

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R         Top of page


Relay (Relay Driving)
Common practice in the less-than-truckload industry, in which one driver takes a truck for 8 to 10 hours, then turns the truck over to another driver, pony express style.

Reefer
Refrigerated trailer with insulated walls and a self-powered refrigeration unit. Most commonly used for transporting food.

Retarder
Device used to assist brakes in slowing the vehicle. The most common type of retarder on over-the-road trucks manipulates the engine's valves to create engine drag. (This type is commonly referred to as "Jake Brake" because the predominant manufacturer is Jacobs Vehicle Equipment Co.) Other types of retarders include exhaust retarders, transmission-mounted hydraulic retarders and axle-mounted electromagnetic retarders.

RFG (Reformulated Gasoline)
Gasoline blended with pollution reducing additives.

RoadRailer
Semitrailer specially designed to travel both on highway and on rails. Manufactured by Wabash Corp.

Rolling Radius
Tire dimension from center of the axle to the ground; measured with tire loaded to rated capacity. Used in calculating geared speed.

RPM (Revolutions Per Minute)
Measure of the speed at which a shaft spins. Most often used to describe engine crankshaft speed. Indicated by a tachometer.

Runaway Truck Ramp
Emergency area adjacent to a steep downgrade that a heavy truck can steer into after losing braking power. Usually two or three lanes wide and several hundred feet long, the ramp is a soft, gravel-filled pathway which absorbs the truck's forward momentum, bringing it to a safe stop. Depending on the surrounding terrain, the ramp may be level or run up or down hill.

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Semitrailer
Truck trailer supported at the rear by its own wheels and at the front by a fifth wheel mounted to a tractor or dolly.

Setback Axle
Front steering axle moved rearward from the generally accepted standard position. Advantages: Shorter turning radius and more of a vehicle's weight shifted to front axle.

Shipping Weight
"Dry" weight of a truck including all standard equipment, but excluding fuel and coolant.

Single-Source Leasing
Service in which companies can lease drivers and trucks from the same source, rather than having to procure them from different companies.

Sleeper
Sleeping compartment mounted behind a truck cab, sometimes attached to the cab or even designed to be an integral part of it.

Sleeper Team
See Team.

Sliding Fifth Wheel
Fifth wheel mounted to a mechanism that allows it to be moved back and forth for the purpose of adjusting the distribution of weight on the tractor's axles. Also provides the capability to vary vehicle combination lengths.

Sliding Tandem (Slider)
Mechanism that allows a tandem axle suspension to be moved back and forth at the rear of a semitrailer, for the purpose of adjusting the distribution of weight between the axles and fifth wheel.

Speedability
Top speed a vehicle can attain as determined by engine power, engine governed speed, gross weight, driveline efficiency, air resistance, grade and load.

Spoke Wheel
See Cast Spoke Wheel.

Spread Axle (Spread Tandem)
Tandem axle assembly spaced further apart than the standard spacing of 54 inches. The U.S. federal bridge formula favors trailer axles with an eight or nine foot spread by allowing higher weight than on tandems wth standard spacing.

Straight Truck
See Truck.

SUV
Sport/utility vehicle.

Synchronized Transmission
Transmission with built-in mechanisms to automatically "equalize" the speed of its gears to allow smooth shifting without the need to double-clutch.

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Tag Axle
See Axle.

Tare Weight
See Chassis Weight.

Tariff
A tariff is a published listing of your rates and charges and the rules that apply to the transportation of a residential household goods shipment.

Tandem Axle (Tandems)
Pair of axles and associated suspension usually located close together. (see Spread Axle)

Team (Driver Team)
Team of two drivers who alternative driving and resting.

TEU (Twenty-Foot Equivalent Unit)
Standardized unit for measuring container capacity on ships, railcars, etc.

TL (Truckload)
The quantity of freight required to fill a trailer; usually more than 10,000 pounds. (see LTL)

TL Carrier
Trucking company which dedicates trailers to a single shipper's cargo, as opposed to an LTL (Less Than Truckload) carrier which transports the consolidated cargo of several shippers and makes multiple deliveries. (see LTL Carrier)

TOFC (Trailer On Flatcar)
Method of moving cargo which involves transporting semitrailers on railroad flat cars. (see Piggyback) Tractor
Truck designed primarily to pull a semitrailer by means of a fifth wheel mounted over the rear axle(s). Sometimes called a truck tractor or highway tractor to differentiate from it from a farm tractor.

Tractor Trailer
Tractor and semitrailer combination.

Tri-Axle
Truck, tractor or trailer with three axles grouped together at the rear. (see Tridem)

Tridem
Group of three axles on a truck, tractor or trailer. Tridems are most common on European semitrailers.

Trip Leasing
Leasing a company's vehicle to another transportation provider for a single trip.

Trip Recorder (On-Board Computer)
Cab-mounted device which electronically or mechanically records data such as truck speed, engine rpm, idle time and other information useful to trucking management.

Truck
Vehicle which carries cargo in a body mounted to its chassis, rather than on a trailer towed by the vehicle.

Twins (Twin Trailers)
See Doubles.

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ULEV
Ultra-low emissions vehicle.

Upper Coupler
Load bearing surface on the underside of the front of a semitrailer. It rests on the fifth wheel of a tractor or dolly and has a downward-protruding kingpin which is captured by the locking jaws of the fifth wheel.

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VIN (Vehicle Identification Number)
Assigned by the manufacturer, this number is unique to each vehicle and appears on the vehicle's registration and title.

VMRS (Vehicle Maintenance Reporting Standards)
Set of codes developed to facilitate computerized tracking of parts and labor used in equipment repair. Established and maintained by the American Trucking Associations.

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Walking Beam Suspension
Type of truck and tractor rear suspension consisting of two beams, one at each side of the chassis, which pivot in the center and connect at the front to one axle of a tandem and at the rear to the other axle.

Way bill
Description of goods sent with a common carrier freight shipment.

WIM (Weigh-In-Motion)
Technology for determining a vehicle's weight without requiring it to come to a complete stop.

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Yard Jockey
Person who operates a yard tractor.

Yard Tractor or Yard Goat
Special tractor used to move trailers around a terminal, warehouse, distribution center, etc.

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