Motor carrier classes by state
Two Oklahoma statutes name this trade outright. One takes the truck-tractor and dump semitrailer out of the bridge formula. The other sets a liability limit for intrastate carriers of sand, rock, gravel and asphaltic mixtures and excuses exactly those carriers from filing cargo insurance. Very few states legislate at a dump operator by name once. Oklahoma does it twice, in two different chapters.
Aggregate work carries a familiar underwriting profile wherever it is done: many short trips, long stretches spent off the road surface, and hoist and tailgate damage that a schedule written around a tractor never anticipated. The dump trucking insurance page takes that up, so this page stays with what Oklahoma itself adds.
Oklahoma’s contribution is unusually direct. Most weight statutes describe axles and spacings and leave the reader to work out which vehicles they catch. Oklahoma’s weight statute names dump equipment in its own text and then writes a rule for it. And the state’s motor carrier act names the commodities this trade hauls and attaches an insurance requirement to them.
The practical consequence is that an Oklahoma aggregate file can be checked against statutory language rather than against custom. Whether a combination has to satisfy the bridge formula depends on how it is configured, not on how it is described. Whether the operation needs a cargo filing depends on what it hauls. Whether a load may exceed the ordinary limits depends on which of two entirely different permits was bought — one sold per trip and per thousand pounds, the other sold once a year against a statutory commodity list.
Sourcing note for everything below: figures are read from the Oklahoma Senate’s published Title 47 and, where the 2022 motor vehicle act rewrote a section, from the enrolled text of that act. Each figure is stated with the amendment or enactment line its own source displays.
Placing an Oklahoma sand, rock or gravel operation? Tell us the Corporation Commission filing status when you send the trucks — here the liability limit and the cargo filing question are both answered by what is in the body.
47 O.S. § 14-109(A) sets the ordinary rule an operator expects: no single axle weight over twenty thousand (20,000) pounds, and total gross not exceeding the value calculated under the Federal Bridge formula imposed by 23 U.S.C. § 127. Subsection (B) then removes one configuration from the second half of that rule: “Except as to gross limits, the formula of this section shall not apply to a truck-tractor and dump semitrailer when used as a combination unit. In no event shall the maximum load in pounds carried by any set of tandem axles exceed thirty-four thousand (34,000) pounds. Any vehicle operating with split tandem axles or tri-axles shall adhere to the formula.”
Three things follow, and each of them is a configuration question rather than a paperwork question. First, the relief is from the spacing formula only — gross limits still bind. Second, the relief is bounded by a hard 34,000-pound cap on any set of tandem axles, so the exemption does not become a route to a heavier tandem. Third, the relief is withdrawn the moment the vehicle runs split tandems or tri-axles, which pushes those configurations back under the formula in full.
That last clause is why Oklahoma’s definitional section matters more than it looks. 47 O.S. § 14-107, last amended by Laws 2019, c. 317, § 1, defines a “tandem axle” as any two or more consecutive axles whose centers are more than forty (40) inches apart but not more than ninety-five (95) inches apart, and defines a “split tandem axle” as any group of two or more consecutive axles where the center of any two adjacent axles exceeds ninety-five (95) inches but does not exceed one hundred twenty (120) inches. The line between keeping the carve-out and losing it sits at ninety-five inches, measured between axle centers.
The same section defines an axle load by reference to two parallel transverse vertical planes forty (40) inches apart, and defines dual lane or trunnion axles and trunnion axle groups. For a fleet that spreads its axles to gain formula weight elsewhere, the Oklahoma reading is worth doing before the trailer is ordered: a spread that helps under the formula may be the spread that moves the unit out of subsection (B) altogether.
Two allowances sit further down the same section and both are natively codified here. Subsection (G) adds four hundred (400) pounds to the gross limits where the vehicle runs an auxiliary power or idle reduction unit, on condition that the operator holds written proof or certification of what that unit weighs and can show the technology is fully functional. The allowance is capped at “four hundred (400) pounds or the actual proven or certified weight of the unit, whichever is less.” And 47 O.S. § 14-109.3, added by Laws 2016, c. 65, § 1 effective July 1, 2016, allows up to two thousand (2,000) pounds for a vehicle fueled wholly or partially by compressed or liquefied natural gas, extended to interstate highways under the exemption at 23 U.S.C. § 127(s) as amended by section 1410 of the Fixing America’s Surface Transportation Act of 2015.
47 O.S. § 230.30, in the Oklahoma Motor Carrier Safety and Hazardous Materials Transportation Act and added by Laws 1995, c. 143, § 10 effective November 1, 1995, is the most commercially specific provision this trade will encounter in Oklahoma. Subsection (B), which otherwise requires every motor carrier to file a cargo insurance policy or bond with the Corporation Commission, carries a sentence addressed to this business by name: “Intrastate motor carriers of sand, rock, gravel, asphaltic mixtures or other similar road building materials shall not be required to file cargo insurance and shall be required to maintain liability insurance limits of Three Hundred Fifty Thousand Dollars ($350,000.00) combined single limit.”
That single sentence does two separate things, and they should not be collapsed. It removes a filing obligation — the cargo filing — for carriers of those commodities. And it states a liability figure in combined single limit form for the same group. An operator hauling road building material intrastate is therefore reading a different insurance requirement from the general carrier standing next to it at the Commission counter.
One hedge is load-bearing and must travel with the figure. The general rule in subsection (A) is that the liability policy or bond filed before a license issues “shall be in a sum and amount as fixed by a proper order of the Commission,” and subsection (B) repeats the same formula for cargo. The $350,000 is what the statute states for road building material carriers; whether a Commission order sets a different figure for a particular authority is a question for the order, not for the statute. Read the two together rather than treating the statutory number as the end of the inquiry.
Subsection (B) also constrains who may write the paper. No carrier whose principal place of business is in Oklahoma may operate unless covered by “a valid primary bond or insurance policy issued by a provider authorized or approved by the State Insurance Commissioner,” and no carrier at all may operate unless covered by a policy from a provider authorized and approved through the National Association of Insurance Commissioners and certified by the State Insurance Commission. Admitted status is not a preference here; it is written into the operating condition.
The lapse mechanics are severe and they are worth putting in front of any operator who has ever let a policy run to the wire. Under subsection (C), failure for any cause to maintain the coverage in full force “shall immediately, without any notice from the Commission, suspend the rights of the carrier to operate until proper insurance is provided.” A suspended carrier has “a reasonable time, not exceeding sixty (60) days,” to reactivate on a showing that it did not operate while uninsured and that proper coverage is now in place. Subsection (D) then cancels the license by operation of law, again without notice, for any carrier that fails to reactivate inside the sixty days, with a ninety-day window to file for reinstatement.
For placement, that chain argues for treating the Oklahoma filing as an operating asset rather than as a certificate. A gap in trucking auto liability does not merely create an uninsured period; it suspends authority the same day. And because the cargo exemption is commodity-based, a fleet that adds non-aggregate freight can walk back into a motor truck cargo filing requirement without anyone re-reading the statute.
47 O.S. § 14-101(E), as rewritten by the 2022 motor vehicle act effective July 1, 2022, subjects all size, weight and load provisions of §§ 14-101 through 14-123 “to a gross vehicle weight limit of ninety thousand (90,000) pounds when applied to a vehicle operating off the National System of Interstate and Defense Highways unless such vehicle is operating in full compliance with an overweight permit issued by the Executive Director of the Department of Transportation.”
That figure sits above the federal 80,000-pound Interstate number and below the permit tier, which gives Oklahoma a middle band that many neighboring regimes do not have. A combination configured for state and county work can be built to a ceiling that the Interstate itself will not carry, and the route decision then becomes a weight decision. It is also the reason an Oklahoma equipment schedule and an Oklahoma routing description should be read together rather than separately.
The same 2022 act moved permitting authority itself. Where the statutes previously directed the Commissioner of Public Safety to issue permits, set fees and endorse night movement, they now direct the Executive Director of the Department of Transportation. An operator holding older paperwork, or working from an older summary, will find the agency name has changed even where the substantive rule has not.
Movement windows are set in the same section. Subsection (F) confines any permitted movement other than a purely overweight one to daylight hours, and defines the term in statute: “one-half (1/2) hour before sunrise to one-half (1/2) hour after sunset,” with a good-cause endorsement available for nighttime travel. Subsection (G) then publishes a two-column holiday calendar. Permitted movement is barred on New Year’s Day, Memorial Day, the Fourth of July, Labor Day, Thanksgiving Day and Christmas Day. It is expressly allowed on Martin Luther King, Jr.’s Birthday, President’s Day and Veteran’s Day. A calendar that names the permitted days as well as the prohibited ones removes an argument that would otherwise be had at the roadside.
Hauling road building material intrastate in Oklahoma? The statutory liability figure and the cargo filing exemption are keyed to the commodity, so tell us what the trucks actually carry before we quote the limits.
47 O.S. § 14-109(D) runs a commodity-scoped annual permit, and the commodity list is written into the statute rather than into a rule. The 2022 text lists vehicles transporting “roll-off recycle metals, rock, sand, gravel, coal, flour, timber, pulpwood, and chips in their natural state, oil field fluids, oil field equipment or equipment used in oil and gas well drilling or exploration,” together with grain, fertilizer, cottonseed, cotton, livestock, peanuts, canola, sunflowers, soybeans, feed, and other raw or unprocessed agricultural products.
Four conditions attach, and every one of them is numeric or documentary:
The permit itself is a purchase with a stated price. Paragraph 2 requires the vehicle to register for the maximum allowable rate and then to buy “a nontransferable annual special overload permit” for a fee of Three Hundred Fifty Dollars ($350.00), with all monies deposited to the credit of the Highway Construction and Maintenance Fund. The parallel provision for utility and refuse collection vehicles and for wrecker or tow combinations, at subsection (I), sets a One Hundred Dollars ($100.00) annual special overload permit on the same deposit terms.
The distinction that matters for an underwriter is that the five and eight percent figures are what the permit authorizes, not a margin the law extends to everybody. They are bought annually, per vehicle, against a registration at the maximum allowable rate, and they are unavailable on the Interstate system. A file showing loaded weights a few percent over the ordinary limits is either a file with a current annual permit in it or a file with a violation in it, and the permit is the document that tells the two apart.
The refuse and utility exception at subsection (F)(1)(a) works differently again: gross vehicle weight for a utility or refuse collection vehicle “may not exceed the otherwise applicable weight by more than fifteen percent (15%),” with weight on individual axles capped at “the manufacturer’s component rating which includes axle, suspension, wheels, rims, brakes, and tires as shown on the vehicle certification label or tag,” and with interstate highways excluded. That is a fifteen percent allowance tied to a component rating, and it belongs to a different vehicle class from an aggregate dump.
47 O.S. § 14-101(A) begins with an express preemption: the maximum size and weight of vehicles specified in the chapter “shall be lawful throughout this state and local authorities shall have no power or authority to alter the limitations except as express authority may be granted in this chapter.” The single express grant is 47 O.S. § 14-113, last amended by Laws 2001, c. 249, § 8, and it is drafted around what it withholds as much as what it gives.
The grant itself is conventional. The Director of the Department of Transportation for the state highway system, or local authorities for highways under their jurisdiction as defined in Title 69, may prohibit the operation of vehicles or impose weight restrictions on a highway, detour or bridge where deterioration or weather would otherwise leave it seriously damaged or destroyed unless traffic is stopped or the permissible weight cut. The section then states its own purpose for local authorities in terms that limit it: to give them “an opportunity to prevent or minimize an immediate threat of serious harm or destruction” to a road under their jurisdiction.
Then comes the withholding, and it is stated as a prohibition rather than as a silence: “Nothing stated herein shall be construed to grant local authorities the right to issue permits designed to regulate the use of overweight vehicles upon highways subject to their jurisdiction, and the issuance of such permits is expressly prohibited.” A municipality in Oklahoma can shut a route to weight. It cannot open one.
That changes how a haul route negotiation actually goes. Where a local restriction blocks the shortest path from a pit to a placement site, there is no municipal counter available. The remedies are a different route, a state permit where the road is a state highway, or waiting out the restriction. An operator who has been told by a city engineer that a permit can be arranged is being told something the statute forbids.
A restriction under § 14-113 also carries a two-part condition precedent. It takes effect only once signs giving notice have been erected on the affected highway, detour or bridge and the Department of Public Safety has been notified. Both halves must be satisfied before a restriction binds anyone. 47 O.S. § 15-102(A)(7) routes the local restriction power back through § 14-113, and § 15-102(C) makes an ordinance enacted under that paragraph ineffective “until signs giving notice of such local traffic regulations are posted upon or at the entrances to the highway or part thereof affected as may be most appropriate.”
For movement that is not covered by an annual permit, 47 O.S. § 14-116(A) as rewritten in 2022 sets a two-part charge: the Executive Director of the Department of Transportation “shall charge a minimum permit fee of Forty Dollars ($40.00) for any permit issued pursuant to the provisions of Section 14-101 et seq. of this title,” and in addition “shall charge a fee of Ten Dollars ($10.00) for each thousand pounds in excess of the legal load limit.” The mechanism is what an operator should plan against: the marginal cost of weight is linear and it is quoted per thousand pounds, so the arithmetic on a single-trip move is done before the truck is loaded rather than after.
Subsection (B) authorizes an escrow account system for permit fees. Authorized motor carriers “meeting established credit requirements” may draw permits against escrow from all size and weight permit offices in the state, and carriers that do not participate “shall be required to make payment of the required fee or fees upon purchase of each permit as required by law.” For a fleet running frequent permitted moves, that is the difference between a standing arrangement and a transaction at every window.
Two conditions in the same section behave like contract terms. Subsection (D) states that “No overweight permit shall be valid until all license taxes due the State of Oklahoma have been paid,” which chains the permit’s validity to the registration account rather than to the permit fee. And subsection (E) resolves the situation an operator worries about most: “No permit violation shall be deemed to have occurred when an oversize or overweight movement is made pursuant to a permit whose stated weight or size exceeds the actual load.” Overstating the permit is not itself a violation.
47 O.S. § 14-118(A)(3) adds a delivery charge of Two Dollars ($2.00) “for each permit requested to be issued by facsimile machine or by any other means of electronic transmission, transfer or delivery,” in addition to any other fee assessed. Paragraph 2 of the same subsection requires the permit system itself to include “provisions for duration, seasonal factors, hours of the day or days when valid, special requirements as to flags, flagmen and warning or safety devices” — a statutory instruction that the permit, not a separate rulebook, is where a movement’s conditions are found.
Multi-state permitting has its own hook. 47 O.S. § 14-118.1, also rewritten in 2022, authorizes the Department of Transportation “to enter into agreements with governmental entities outside this state for the issuance of regional and national oversize and overweight permits for single-trip nondivisible loads,” with the Executive Director adopting the implementing rules and remitting fees through a departmental special account. That program is written for freight that cannot be broken down, so it belongs to the oversized and overweight half of a mixed fleet rather than to the trucks hauling stone.
47 O.S. § 14-118(B) requires the Transportation Commission to prepare and publish a map showing “by appropriate symbols the various highway structures and bridges in terms of maximum size and weight restrictions,” titled the “Oklahoma Load Limit Map.” The statute then puts the publication on a clock in two forms: “in no event shall a period of two (2) years lapse between revisions and publication of the printed version,” and for the internet version, “in no event shall a period of six (6) months lapse between revisions of the information provided on the Internet.”
A routing instrument with a statutory refresh cadence is unusual and it is useful. It means an operator can state, from the statute rather than from custom, how stale the published structure restrictions are allowed to be. It also means a routing decision defended by reference to an old printed map has a ceiling on how old the map is permitted to have been.
Damage liability runs in two tracks and neither is forgiving. 47 O.S. § 14-114(a) makes the owner and operator of a vehicle that strikes and damages an overpass or underpass “absolutely liable to the owner or owners of such overpass or underpass thereby damaged for the amount of such damage, regardless of the height of such vehicle and regardless of the clearance in such overpass or underpass,” and states expressly that insufficient height “shall not be a defense to any action for such damages.” The single condition on enforceability is signage: the section applies “only in the event the overpass or underpass so damaged has a sign on each side thereof clearly legible and correctly stating the clearance thereof in feet and inches.”
That provision reaches dump operations for a reason unrelated to load height. A raised body is a height event, and a raised body leaving a site is one of the recurring loss patterns in this class. Absolute liability, with the height of the vehicle expressly irrelevant, is a materially different exposure from ordinary negligence, and it is worth reading beside the physical damage and liability schedules rather than after a loss.
Subsection (b) covers the road itself. The driver, owner and any other person, firm or corporation responsible for a vehicle being on the highways or county roads is responsible for all damage the highway, bridges, pavement and other public property may sustain from a violation of the chapter or from negligent or improper operation. For permitted movement the standard is stricter still: responsibility attaches “whether caused by negligence or not, and no further permits shall be issued to such owner or operator until payment has been made for such damages.” The statute then closes the obvious argument: “The issuance of any special permit shall not be considered a warranty of any bridge or highway to support the permitted load.”
47 O.S. § 14-111(A) authorizes officers of the Department of Public Safety, the Corporation Commission, sheriffs and salaried deputy sheriffs to stop and weigh a vehicle by portable or stationary scales, or to require it to be driven to the nearest or most convenient available scales. Where portable scales are used, the section grants the driver a specific and checkable right: the officer “shall allow the driver of the vehicle to move the vehicle to the most level weighing area available within two (2) miles of the stop.”
Two miles is a meaningful distance on a rural haul road, and the right is worth knowing because it is not discretionary. A portable-scale reading taken on a crowned or sloped shoulder without offering the move is a reading taken outside the statute’s own procedure.
What follows an overweight finding is the part that produces claims. In the case of separable loads, the officer may require the driver, operator or owner to unload at the site as much of the load as is necessary to bring the vehicle down to the lawful weight, and the statute then allocates the consequences: the material that comes off is cared for by the owner or operator, at that owner or operator’s own risk. Aggregate is a separable load, so this is the roadside remedy the trade actually meets — a pile of stone on a shoulder, in the operator’s custody, with the risk placed by statute rather than by argument. Livestock, perishable merchandise and weather-destructible merchandise get a different treatment: the driver may proceed to the nearest practical unloading point toward the destination first.
Liability for the overload is not confined to the driver. 47 O.S. § 14-119 makes it a misdemeanor for “Any common, contract, or private motor carrier or any shipper, firm, corporation, or other person who willfully or knowingly transports a load having a capacity greater than the axle or gross weights authorized by statute or by special permit,” and reaches equally anyone “who loads or causes or requires a vehicle to be loaded to said capacity.” The pit that fills the truck is inside the offense alongside the carrier that moves it, which is a fact worth establishing in a haul contract before it is established in a prosecution.
One narrowing provision runs the other way. 47 O.S. § 14-109.1 provides that motor vehicle load overweight violations “shall not be recorded as traffic offenses on the driving record of the operator of the vehicle,” unless the operator is the owner of the vehicle or owns a majority of the stock of the company that owns it. Overweight in Oklahoma is generally a company matter rather than a driver-record matter — which changes what a motor vehicle record will and will not reveal about a fleet’s weight history, and argues for reading the citation file rather than the MVR.
The state minimum is a licensing threshold. The program an operator actually needs is built from these lines:
We write dump and aggregate hauling as a named class rather than as an exception to general trucking, and we read each account against the weight and permit regime of the state it operates in. For a Oklahoma operator that means starting from what the trucks are actually licensed and configured to carry, sizing physical damage to bodies and hoists rather than to a chassis value, and treating pit, stockpile and job-site work as its own exposure rather than an extension of the highway auto form.
If the operation also runs freight under separate authority, the Oklahoma trucking insurance page covers the state’s broader motor carrier picture, and the dump trucking insurance page covers the class mechanics that apply wherever the operator runs.
Not for spacing. 47 O.S. § 14-109(B) provides that, except as to gross limits, the formula does not apply to a truck-tractor and dump semitrailer used as a combination unit, and caps any set of tandem axles at thirty-four thousand pounds. The carve-out is lost if the vehicle operates with split tandem axles or tri-axles, which the statute returns to the formula. Section 14-107 defines a tandem as more than forty but not more than ninety-five inches between axle centers, and a split tandem as more than ninety-five but not more than one hundred twenty.
47 O.S. § 230.30(B) requires intrastate motor carriers of sand, rock, gravel, asphaltic mixtures or other similar road building materials to maintain liability insurance limits of Three Hundred Fifty Thousand Dollars combined single limit. That is the statutory figure for those commodities. The general rule in subsection (A) is that the policy or bond filed with the Corporation Commission shall be in a sum and amount as fixed by a proper order of the Commission, so a particular authority may be subject to an order as well as to the statute.
The same sentence that sets the liability figure removes the cargo filing. Section 230.30(B) provides that intrastate motor carriers of sand, rock, gravel, asphaltic mixtures or other similar road building materials shall not be required to file cargo insurance. The exemption is keyed to the commodity, so a fleet that adds freight outside that list is reading the general cargo filing requirement again rather than the exemption.
47 O.S. § 14-101(E) subjects the size, weight and load provisions of sections 14-101 through 14-123 to a gross vehicle weight limit of ninety thousand pounds when applied to a vehicle operating off the National System of Interstate and Defense Highways, unless the vehicle is operating in full compliance with an overweight permit issued by the Executive Director of the Department of Transportation. The section was rewritten by the 2022 motor vehicle act effective July 1, 2022.
47 O.S. § 14-109(D) allows a vehicle carrying commodities on the statutory list, which leads with rock, sand and gravel, to exceed the subsection A gross limits by five percent and the axle limits by eight percent, provided the vehicle is registered for the maximum allowable rate and no component exceeds its manufacturer rating on the certification label. The permit is nontransferable, annual, and costs Three Hundred Fifty Dollars. Vehicles operating under it may not use the National System of Interstate and Defense Highways.
No. 47 O.S. § 14-113 lets local authorities prohibit operation or reduce permissible weights on roads under their jurisdiction when climatic conditions would seriously damage them, then states that nothing in the section grants local authorities the right to issue permits regulating the use of overweight vehicles on those highways, and that the issuance of such permits is expressly prohibited. A local restriction is effective only when signs are erected and the Department of Public Safety has been notified.
47 O.S. § 14-116(A) sets a minimum permit fee of Forty Dollars for any permit issued under section 14-101 et seq., plus a fee of Ten Dollars for each thousand pounds in excess of the legal load limit. Section 14-118(A)(3) adds Two Dollars for a permit issued by facsimile or other electronic transmission. No overweight permit is valid until all Oklahoma license taxes are paid, and a permit stating more weight or size than the actual load is not a violation.
47 O.S. § 14-114(a) makes the owner and operator absolutely liable for the damage regardless of the height of the vehicle and regardless of the clearance, and states that insufficient clearance is not a defense. The section is enforceable only where the structure carries a sign on each side clearly and correctly stating the clearance in feet and inches. Subsection (b) separately makes a permitted operator responsible for damage to bridges and roads whether caused by negligence or not, and blocks further permits until payment is made.
Every figure on this page was read at the source below on August 11, 2026, with the effective date of the version read. Treat each as current as of that date rather than as permanent.
Send the declared or registered weights alongside the axle configurations, and tell us where the material moves from. We will size the program against the work the trucks actually do rather than against a statutory floor.
