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RSMo 301.010effective 28 Aug 2025

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This law gives the official definitions for words used in Missouri's vehicle and traffic laws. It explains exactly what counts as different types of vehicles and vehicle-related businesses — like what makes something an all-terrain vehicle, a motorcycle, a trailer, a dealer, or a salvage vehicle. These definitions are used to apply Missouri's vehicle registration and road rules correctly.

Word-for-word law

301.010. Definitions. — As used in this chapter and sections 304.010 to 304.040, 304.120 to 304.260, and sections 307.010 to 307.175, the following terms mean:

(1) "", any motorized vehicle d and used exclusively for off- use, with an of one thousand five hundred or less, traveling on three, four or more nonhighway tires, with either:

(a) A seat designed to be straddled by the , and handlebars for steering control, but excluding an electric bicycle; or

(b) A width of fifty inches or less, measured from outside of tire rim to outside of tire rim, regardless of seating or steering arrangement;

(2) "", a three-wheeled motor vehicle which the drivers and passengers ride in a partially or completely enclosed nonstraddle seating area, that is designed to be controlled with a steering wheel and pedals, and that has met applicable of Transportation requirements or federal motorcycle safety standards;

(3) "Automobile transporter", any vehicle combination capable of carrying on the power unit and designed and used for the transport of assembled motor vehicles, including truck camper units;

(4) "", the total load transmitted to the road by all wheels whose centers are included between two parallel transverse vertical planes forty inches apart, extending across the full width of the vehicle;

(5) "", the trip of a vehicle transporting cargo or general freight, especially when carrying goods back over all or part of the same route;

(6) "Boat transporter", any vehicle combination capable of carrying cargo on the power unit and designed and used specifically to transport assembled boats and boat hulls. Boats may be partially disassembled to facilitate transporting;

(7) "Body shop", a business that repairs physical damage on motor vehicles that are not owned by the shop or its officers or employees by mending, straightening, replacing body parts, or painting;

(8) "Bus", a motor vehicle primarily for the transportation of a driver and eight or more passengers but not including shuttle buses;

(9) "", a motor vehicle designed or regularly used for carrying freight and , or more than eight passengers but not including vanpools or shuttle buses;

(10) "Cotton trailer", a trailer designed for transporting cotton at speeds less than seventy miles per hour from field to field or from field to market and return;

(11) "", any person, firm, , , or subagent engaged in the sale or exchange of new, used or s or trailers;

(12) "" or "", the ;

(13) "":

(a) The movement of a motor vehicle or trailer by any person or motor other than a dealer over any public highway, under its own power singly, or in a combination of two or more vehicles, for the purpose of for sale or for delivery either before or after sale;

(b) The movement of any vehicle or vehicles, not owned by the transporter, constituting the being transported, by a person engaged in the business of furnishing drivers and operators for the purpose of transporting vehicles from one place to another by the driveaway or methods; or

(c) The movement of a motor vehicle by any person who is lawfully engaged in the business of transporting or delivering vehicles that are not the person's own and vehicles of a type otherwise required to be , by the driveaway or towaway methods, from a point of manufacture, assembly or or from the owner of the vehicles to a dealer or sales agent of a or to any by the shipper or ;

(14) "", a box, deck, or mounted behind the cab and forward of the on the frame of the power unit of a truck tractor- combination. A truck tractor equipped with a dromedary may carry part of a load when operating independently or in a combination with a semitrailer;

(15) "Electric bicycle", a bicycle equipped with fully operable pedals, a saddle or seat for the , and an electric motor of less than 750 watts that meets the requirements of one of the following three classes:

(a) "Class 1 electric bicycle", an electric bicycle equipped with a motor that provides only when the rider is pedaling and that ceases to provide assistance when the bicycle reaches the speed of twenty miles per hour;

(b) "Class 2 electric bicycle", an electric bicycle equipped with a motor that may be used exclusively to propel the bicycle and that is not capable of providing assistance when the bicycle reaches the speed of twenty miles per hour; or

(c) "Class 3 electric bicycle", an electric bicycle equipped with a motor that provides assistance only when the rider is pedaling and that ceases to provide assistance when the bicycle reaches the speed of twenty-eight miles per hour;

(16) "Farm tractor", a tractor used exclusively for agricultural purposes;

(17) "", any group of ten or more motor vehicles owned by the same owner;

(18) "Fleet vehicle", a motor vehicle which is included as part of a fleet;

(19) "Fullmount", a vehicle mounted completely on the frame of either the first or last vehicle in a ;

(20) "", the weight of vehicle and/or vehicle combination without load, plus the weight of any load thereon;

(21) "Hail-damaged vehicle", any vehicle, the body of which has become dented as the result of the impact of hail;

(22) "Highway", any for vehicles, including state roads, county roads and public streets, avenues, boulevards, parkways or alleys in any ;

(23) "Improved highway", a highway which has been paved with gravel, macadam, concrete, brick or asphalt, or surfaced in such a manner that it shall have a hard, smooth surface;

(24) "Intersecting highway", any highway which joins another, whether or not it crosses the same;

(25) " vehicle", a vehicle which:

(a) Is incapable of operation or use upon the highways and has no value except as a source of parts or scrap; or

(b) Has been designated as junk or a substantially equivalent designation by this state or any other state;

(26) "", a motor vehicle assembled by a person other than a generally manufacturer of motor vehicles by the use of a glider kit or replica purchased from an manufacturer and accompanied by a ;

(27) "", any not-for-hire commercial motor vehicle the operation of which is confined to:

(a) An area that extends not more than a radius of one hundred fifty miles from its home base of operations when transporting its owner's machinery, equipment, or supplies to or from projects involving soil and water , or to and from equipment dealers' facilities for maintenance purposes; or

(b) An area that extends not more than a radius of fifty miles from its home base of operations when transporting its owner's machinery, equipment, or auxiliary supplies to or from projects not involving soil and water conservation.

(28) "", a commercial motor vehicle whose operations are confined to a municipality and that area extending not more than fifty miles therefrom, or a commercial motor vehicle whose property-carrying operations are confined solely to the transportation of property owned by any person who is the owner or operator of such vehicle to or from a farm owned by such person or under the person's control by virtue of a landlord and ; provided that any such property transported to any such farm is for use in the operation of such farm;

(29) "", a commercial motor vehicle which is registered this chapter to operate as a motor vehicle on the public highways of this state; used exclusively in this state; used to transport har forest products; operated solely at a and in an area extending not more than a one hundred fifty mile radius from such site; and when operated on the system of and highways described in 23 U.S.C. Section 103, as amended, or outside the one hundred fifty mile radius from such site with an , does not have more than four s, and does not pull a trailer which has more than three axles. Harvesting equipment which is used specifically for cutting, felling, trimming, delimbing, debarking, chipping, skidding, loading, unloading, and stacking may be transported on a local log truck;

(30) "", a commercial motor vehicle which is registered under this chapter to operate as a motor vehicle on the public highways of this state; used exclusively in this state; used to transport harvested forest products, operated at a forested site and in an area extending not more than a one hundred fifty mile radius from such site; and when operated on the national system of interstate and defense highways described in 23 U.S.C. Section 103, as amended, or outside the one hundred fifty mile radius from such site with an extended distance local log truck permit, does not have more than three axles and does not pull a trailer which has more than three axles;

(31) "", a bus whose operations are confined wholly within a , or wholly within a municipal corporation and a , as defined in section 390.020, , forming a part of a public transportation system within such municipal corporation and such municipal corporation and adjacent commercial zone;

(32) "Log truck", a vehicle which is not a local log truck or local log truck tractor and is used exclusively to transport harvested forest products to and from forested sites which is registered pursuant to this chapter to operate as a motor vehicle on the public highways of this state for the transportation of harvested forest products;

(33) "Major component parts", the rear clip, cowl, frame, body, cab, front-end assembly, and front clip, as those terms are defined by the director of revenue pursuant to or by illustrations;

(34) "Manufacturer", any person, firm, corporation or association engaged in the business of manufacturing or assembling motor vehicles, trailers or vessels for sale;

(35) "", a vehicle manufactured prior to August, 1957, which receives a new, rebuilt or used engine, and which used the number stamped on the original engine as the ;

(36) "Motor vehicle", any self-propelled vehicle not operated exclusively upon tracks, except farm tractors and electric bicycles;

(37) "Motor vehicle primarily for business use", any vehicle other than a recreational motor vehicle, motorcycle, , or any commercial motor vehicle licensed for over twelve thousand pounds:

(a) Offered for hire or lease; or

(b) The owner of which also owns ten or more such motor vehicles;

(38) "Motorcycle", a motor vehicle operated on two wheels;

(39) "Motorized bicycle", any two-wheeled or three-wheeled device having an automatic transmission and a motor with a cylinder of not more than fifty cubic centimeters, which produces less than three gross brake horsepower, and is capable of propelling the device at a maximum speed of not more than thirty miles per hour on level ground, but excluding an electric bicycle;

(40) "Motortricycle", a motor vehicle upon which the operator straddles or sits astride that is designed to be controlled by handle bars and is operated on three wheels, including a motorcycle while operated with any , temporary or otherwise, requiring the use of a third wheel, but excluding an electric bicycle. A motortricycle shall not be included in the definition of all-terrain vehicle;

(41) "Municipality", any city, town or village, whether incorporated or not;

(42) "", a resident of a state or country other than the state of Missouri;

(43) "", a motor vehicle not originally manufactured in with United States emissions or safety standards;

(44) "Operator", any person who operates or drives a motor vehicle;

(45) "Owner", any person, firm, corporation or association, who holds the to a vehicle or who has a buyer's or with a licensed under sections 301.550 to 301.580 for the purchase of a vehicle with an immediate right of vested in the , or in the event a vehicle is the subject of an agreement for the or lease thereof with the right of purchase upon performance of the conditions stated in the agreement and with an immediate right of possession vested in the or , or in the event a of a vehicle is end to possession, then such conditional vendee or lessee or mortgagor shall be the owner;

(46) "Public garage", a place of business where motor vehicles are housed, stored, repaired, reconstructed or repainted for persons other than the owners or operators of such place of business;

(47) "Rebuilder", a business that repairs or rebuilds motor vehicles owned by the rebuilder, but does not include common or contract carriers of persons or property;

(48) "Reconstructed motor vehicle", a vehicle that is altered from its original by the addition or of two or more new or used major component parts, excluding motor vehicles made from all new parts, and new multistage manufactured vehicles;

(49) "Recreational motor vehicle", any motor vehicle designed, constructed or substantially so that it may be used and is used for the purposes of temporary housing quarters, including therein sleeping and eating facilities which are either permanently attached to the motor vehicle or attached to a unit which is securely attached to the motor vehicle. Nothing herein shall prevent any motor vehicle from being registered as a commercial motor vehicle if the motor vehicle could otherwise be so registered;

(50) "", any motorized vehicle manufactured and used exclusively for off-highway use which is more than fifty inches but no more than eighty inches in width, measured from outside of tire rim to outside of tire rim, with an unladen dry weight of three thousand five hundred pounds or less, traveling on four or more nonhighway tires and which may have access to ATV trails;

(51) "", any trailer designed, constructed, or substantially modified so that it may be used and is used for the purpose of temporary housing quarters, including therein sleeping or eating facilities, which can be temporarily attached to a motor vehicle or attached to a unit which is securely attached to a motor vehicle;

(52) " or ", any vehicle specifically designed to transport wrecked, or otherwise vehicles, when the transportation is directly connected to a or towing ;

(53) "Saddlemount combination", a combination of vehicles in which a truck or truck tractor tows one or more trucks or truck tractors, each connected by a saddle to the frame or fifth wheel of the vehicle in front of it. The "saddle" is a mechanism that connects the front axle of the towed vehicle to the frame or fifth wheel of the vehicle in front and functions like a fifth wheel kingpin connection. When two vehicles are towed in this manner the combination is called a "double saddlemount combination". When three vehicles are towed in this manner, the combination is called a "triple saddlemount combination";

(54) "", a business that dismantles used motor vehicles for the sale of the parts thereof, and buys and sells used motor vehicle parts and accessories;

(55) "", a motor vehicle, semitrailer, or house trailer which:

(a) Was damaged during a year that is no more than six years after the manufacturer's model year designation for such vehicle to the extent that the total cost of repairs to rebuild or reconstruct the vehicle to its condition immediately before it was damaged for legal operation on the roads or highways exceeds eighty percent of the of the vehicle immediately preceding the time it was damaged;

(b) By reason of condition or circumstance, has been declared , either by its owner, or by a person, firm, corporation, or other exercising the right of in it;

(c) Has been declared salvage by an insurance company as a result of of a ;

(d) Ownership of which is evidenced by a ; or

(e) Is which is titled pursuant to section 304.155 or section 304.157 and designated with the words "salvage/abandoned property". The total cost of repairs to rebuild or reconstruct the vehicle shall not include the cost of repairing, replacing, or reinstalling inflatable safety restraints, tires, sound systems, or damage as a result of hail, or any sales tax on parts or materials to rebuild or reconstruct the vehicle. For purposes of this definition, "fair market value" means the of a motor vehicle as:

a. Set forth in a current edition of any nationally recognized compilation of retail values, including automated databases, or from publications commonly used by the automotive and insurance industries to establish the values of motor vehicles;

b. Determined pursuant to a market survey of vehicles with regard to condition and equipment; and

c. Determined by an insurance company using any other procedure recognized by the insurance industry, including market surveys, that is applied by the company in a manner;

(56) "School bus", any motor vehicle used solely to transport students to or from school or to transport students to or from any place for educational purposes;

(57) "", a business that, through the use of fixed or mobile equipment, flattens, crushes, or otherwise accepts motor vehicles and vehicle parts for processing or transportation to a shredder or for recycling;

(58) "Shuttle bus", a motor vehicle used or maintained by any person, firm, or corporation as an service to transport patrons or customers of the regular business of such person, firm, or corporation to and from the place of business of the person, firm, or corporation providing the service at no fee or charge. Shuttle buses shall not be registered as buses or as commercial motor vehicles;

(59) "", every self-propelled vehicle not designed or used primarily for the transportation of persons or property and incidentally operated or moved over the highways, including farm equipment, , road construction or maintenance machinery, ditch-digging apparatus, stone crushers, air compressors, power shovels, cranes, graders, rollers, well-drillers and wood-sawing equipment used for hire, asphalt spreaders, bituminous mixers, bucket loaders, ditchers, leveling graders, finished machines, motor graders, road rollers, scarifiers, earth-moving carryalls, scrapers, drag lines, concrete pump trucks, rock-drilling and earth-moving equipment. This shall be deemed partial and shall not operate to exclude other such vehicles which are within the general terms of this section;

(60) "", a motor vehicle which shall not have been originally constructed under a distinctive name, make, model or type by a manufacturer of motor vehicles. The term specially constructed motor vehicle includes kit vehicles;

(61) "", a truck tractor-semitrailer wherein the fifth wheel is located on a drop frame located behind and below the rearmost axle of the power unit;

(62) "", a group of two or more axles, arranged one behind another, the distance between the extremes of which is more than forty inches and not more than ninety-six inches apart;

(63) "", a combination of vehicles consisting of a trailer transporter towing unit and two trailers or , with a total weight that does not exceed twenty-six thousand pounds; and in which the trailers or semitrailers carry no property and constitute property of a manufacturer, distributer, or dealer of such trailers or semitrailers;

(64) "Tractor", "truck tractor" or "", a self-propelled motor vehicle designed for drawing other vehicles, but not for the carriage of any load when operating independently. When attached to a semitrailer, it supports a part of the weight thereof;

(65) "Trailer", any vehicle without designed for carrying property or passengers on its own structure and for being drawn by a self-propelled vehicle, except those running exclusively on tracks, including a semitrailer or vehicle of the trailer type so designed and used in conjunction with a self-propelled vehicle that a considerable part of its own weight rests upon and is carried by the towing vehicle. The term trailer shall not include cotton trailers as defined in this section and shall not include manufactured homes as defined in section 700.010;

(66) "Trailer transporter towing unit", a power unit that is not used to carry property when operating in a towaway trailer transporter combination;

(67) "Truck", a motor vehicle designed, used, or maintained for the transportation of property;

(68) "Truck-tractor semitrailer-semitrailer", a combination vehicle in which the two trailing units are connected with a which is a rigid frame extension attached to the rear frame of a first semitrailer which allows for a fifth-wheel connection point for the second semitrailer and has one less than the conventional A-dolly connected truck-tractor semitrailer-trailer combination;

(69) "Truck-trailer boat transporter combination", a boat transporter combination consisting of a straight truck towing a trailer using typically a ball and socket connection with the trailer axle located substantially at the trailer center of gravity rather than the rear of the trailer but so as to maintain a downward force on the trailer tongue;

(70) "", a business that buys and sells used motor vehicle parts or accessories, but not including a business that sells only new, remanufactured or rebuilt parts. Business does not include isolated sales at a swap meet of less than three days;

(71) "", any motorized vehicle manufactured and used exclusively for off-highway use which is more than fifty inches but no more than eighty inches in width, measured from outside of tire rim to outside of tire rim, with an unladen dry weight of three thousand five hundred pounds or less, traveling on four or six wheels, to be used primarily for landscaping, lawn care, or maintenance purposes;

(72) "Vanpool", any van or other motor vehicle used or maintained by any person, group, firm, corporation, association, city, county or , or any member thereof, for the transportation of not less than eight nor more than forty-eight employees, per motor vehicle, to and from their place of ; however, a vanpool shall not be included in the definition of the term bus or commercial motor vehicle as defined in this section, nor shall a vanpool driver be deemed a as that term is defined by section 303.020; nor shall use of a vanpool vehicle for ride-sharing arrangements, recreational, personal, or maintenance uses constitute an unlicensed use of the motor vehicle, unless used for monetary profit other than for use in a ride-sharing arrangement;

(73) "Vehicle", any mechanical device on wheels, designed primarily for use, or used, on highways, except motorized bicycles, electric bicycles, vehicles propelled or drawn by horses or human power, or vehicles used exclusively on fixed rails or tracks, or cotton trailers or motorized wheelchairs operated by handicapped persons;

(74) "Wrecker" or "tow truck", any emergency commercial vehicle equipped, designed and used to assist or render aid and transport or tow disabled or wrecked vehicles from a highway, road, street or highway rights-of-way to a point of storage or repair, including towing a replacement vehicle to replace a disabled or wrecked vehicle;

(75) "Wrecker or towing service", the act of transporting, towing or recovering with a wrecker, tow truck, rollback or car carrier any vehicle not owned by the operator of the wrecker, tow truck, rollback or car carrier for which the operator directly or indirectly receives or other personal .

(RSMo 1939 § 8367, A.L. 1945 p. 1194, A. 1949 S.B. 1110, A.L. 1951 p. 695, A.L. 1969 H.B. 436, A.L. 1974 H.B. 883, A.L. 1979 H.B. 342, S.B. 108, A.L. 1980 H.B. 995 & 1051, A.L. 1983 H.B. 539, A.L. 1983 H.B. 149, et al., A.L. 1985 S.B. 209, S.B. 152, A.L. 1986 H.B. 1367 & 1573, A.L. 1986 H.B. 1067 & 1299 with H.B. 1153, A.L. 1987 S.B. 3, A.L. 1988 H.B. 990, H.B. 1581, A.L. 1989 H.B. 616, Revision, A.L. 1992 H.B. 1794, A.L. 1993 S.B. 105, A.L. 1995 S.B. 70, A.L. 1996 S.B. 560, A.L. 1997 H.B. 381, A.L. 1998 H.B. 1511, A.L. 2000 H.B. 1142 merged with H.B. 1948, A.L. 2004 H.B. 996 and H.B. 1142 and H.B. 1201 and H.B. 1489 merged with H.B. 1284 merged with S.B. 757 merged with S.B. 1233, et al., A.L. 2005 H.B. 487, A.L. 2007 S.B. 82, A.L. 2008 S.B. 930 & 947, A.L. 2009 H.B. 683, A.L. 2012 H.B. 1251 merged with H.B. 1402 merged with H.B. 1647 merged with H.B. 1807, et al. merged with S.B. 470 merged with S.B. 480, A.L. 2014 H.B. 1735 & 1618, A.L. 2015 H.B. 686, A.L. 2016 H.B. 2380, A.L. 2017 S.B. 8 merged with S.B. 222 merged with S.B. 225, A.L. 2018 S.B. 881, A.L. 2019 H.B. 499, A.L. 2020 H.B. 1963, A.L. 2021 S.B. 176, A.L. 2022 1st Ex. Sess. H.B. 3, A.L. 2025 H.B. 169 merged with S.B. 28)

Prior revisions: 1929 §§ 7759, 7761; 1919 § 7551; 1909 § 8502

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RSMo 301.010: Definitions | KnowMo Laws