Motor carrier classes by state
New Mexico allows 21,600 pounds on a single axle, which is its own figure and nobody else’s. It also declines to use the federal bridge formula for gross weight, printing two tables of its own instead, and it charges heavy trucks by the mile through a quarterly tax rather than at the registration counter. An aggregate fleet crossing into New Mexico is entering a different weight system, not a variation on the usual one.
The exposures that make dump and aggregate work hard to place belong to the class rather than to the state — the trip count, the pit and job-site work that strains the boundary of a highway auto form, the hoist and body damage a physical damage schedule rarely priced. Those sit on the dump trucking insurance page and are not repeated here.
New Mexico’s contribution is structural. Most states set an axle limit at the federal figure, compute gross weight from the federal bridge formula, and recover road cost through registration and fuel tax. New Mexico does none of those three the usual way. Its single axle limit is higher, its gross weight comes off statutory tables printed in the code, and the bulk of what a heavy truck pays is a weight distance tax assessed in mills per mile and filed quarterly.
That last instrument is the one that reorganizes an aggregate operation’s cost model. A tax billed by the mile prices an empty return leg the same way it prices a loaded one, unless the operator qualifies for a relief provision written into the tax statute — and the relief provision describes a dump-truck duty cycle almost exactly.
Every figure below was read from the section of NMSA 1978 that sets it, in chapter text published by the New Mexico Compilation Commission, together with that section’s own History line and amendment annotations. Where a date matters it is stated as the code states it.
Running New Mexico miles above 26,000 pounds? Send the declared gross weights and the loaded-versus-empty mileage split — in New Mexico that split is a tax question before it is anything else.
NMSA 1978, § 66-7-409(A) sets the gross weight imposed on the highway by the wheels of any one axle at twenty-one thousand six hundred pounds, and provides in the same sentence that no one wheel may carry a load in excess of eleven thousand pounds. Subsection (C) adds a third control: no wheel equipped with pneumatic, solid rubber or cushion tires may carry a load in excess of six hundred pounds for each inch of tire width, with pneumatic width taken at the manufacturer’s rating and solid and cushion tire width measured at the flange of the rim.
Three axle-related limits stated in one section is unusual on its own. What makes the combination bite for a loaded body is that they are independent: an axle can satisfy 21,600 pounds and still fail on the single-wheel figure or on tire width, and the tire figure is read off equipment the operator chose rather than off the statute.
Section 66-7-409(B) defines the geometry the tables use. A single-axle load is the total load transmitted by all wheels whose centers fall between two parallel transverse vertical planes forty inches or less apart across the full width of the vehicle; a tandem axle load is the same measurement where the planes are more than forty inches but less than one hundred twenty inches apart. The allowed load on tandem axles is then the gross weight given in § 66-7-410 for the respective distance between the axles.
Section 66-7-410 is where New Mexico departs from the pattern most operators expect. Rather than adopting the federal bridge formula for gross weight, it prints two tables. Subsection (A) covers groups of two or more consecutive axles from four to eighteen feet, beginning at 34,320 pounds at four feet and rising in even steps to 45,240 pounds at eighteen feet. Subsection (B) covers distances greater than eighteen feet, beginning at 53,100 pounds at nineteen feet and rising by 900 pounds a foot to 86,400 pounds at fifty-six feet or over.
Measurement is prescribed rather than left to practice: subsection (C) requires the distance between axle centers to be measured to the nearest even foot, with an exact one-half rounding to the next larger whole number. A configuration that sits on a half-foot is being rounded up into the next row, which is a spacing decision worth making deliberately at build time.
Two increases sit on top of the tables at subsection (D). The gross weight limitation is increased by four hundred pounds if the vehicle or combination uses idle reduction technology — a subsection added by the 2007 amendment, effective July 1, 2007. For a natural gas vehicle, the increase is a standard per-axle-distance-category allowance established by the division by rule, equal to the difference between the average weight attributable to the natural gas tank and fuel system and that of a comparable diesel system. The natural gas figure lives in division rule rather than in the statute, and no number for it is asserted here.
Because 86,400 pounds is New Mexico’s own statutory ceiling rather than the familiar federal figure, it turns up again as a fee threshold later on. Reading it as a rounding of 80,000 is the single most expensive misreading available in this state.
NMSA 1978, § 7-15A-3 imposes the weight distance tax on registrants, owners and operators for the use of the highways of the state by all motor vehicles having a declared gross weight or gross vehicle weight in excess of twenty-six thousand pounds and registered in New Mexico, registered under proportional registration, or qualified under §§ 65-1-32 and 65-1-33. Practically every working dump truck clears that threshold, so this is not a specialty tax — it is the general one.
Section 7-15A-6(A) prices it in mills per mile against declared gross weight in 2,000-pound bands. The ladder begins at 14.86 mills per mile for 26,001 to 28,000 pounds and climbs through the bands — 22.59 at 38,001 to 40,000, 31.50 at 48,001 to 50,000, 42.17 at 60,001 to 62,000, 51.11 at 70,001 to 72,000 — to 59.10 mills per mile for 78,001 pounds and over.
The as-of qualifier on those rates is not optional. The section’s History line reads “enacted by Laws 1988, ch. 73, § 33; 2003 (1st S.S.), ch. 3, § 4; 2004, ch. 59, § 1; 2026, ch. 4, § 1,” and the compiler’s annotation states that the 2026 amendment, effective July 1, 2026, increased each weight distance tax rate in Subsection A by thirty-five percent. The ladder above is the ladder as it stands after that increase took effect. Any figure circulating from a document prepared before July 1, 2026 is a pre-increase figure and is materially low.
Filing is quarterly by default. Section 7-15A-9(A) sets the tax due by April 30 for January through March, July 31 for April through June, October 31 for July through September, and January 31 for October through December. Subsection (B) allows a registrant, owner or operator whose total weight distance tax for the previous calendar year was less than five hundred dollars to elect annual payment by filing a written statement on or before April 1, with the year’s tax then due by January 31 following. That election is lost on delinquency exceeding thirty days, and lost automatically once liability reaches five hundred dollars for any calendar year.
Section 7-15A-8 ties the tax back to the weight law and gives it teeth. Subsection (C) requires all vehicles subject to the tax to be registered at the highest gross vehicle weight or combined gross vehicle weight at which the vehicle will operate that year in the state. Subsection (D) makes it unlawful — a violation of the Weight Distance Tax Act — to operate at a gross weight higher than the declared registration weight, and subjects the operator to the penalty provisions of § 66-7-411. Under-declaring to lower a tax rate therefore creates a weight offense as well as a tax one, and both surface in the same enforcement stop.
Records are kept for the tax and available for audit. Section 7-15A-9(D) requires the records supporting the periodic payments to be preserved for four years and made available to the department at the owner’s office, with the department permitted to examine them where they are kept out of state and to arrange joint audits with other jurisdictions.
One administrative figure carries its own ceiling. Section 7-15A-13(A) requires a person obtaining a weight distance tax identification permit to pay an administrative fee for the department’s reasonable and necessary expense, set by regulation, and provides that the fee “shall not exceed ten dollars ($10.00).”
Section 7-15A-6(B) is the provision an aggregate operator should read before anything else in the tax act. All motor vehicles for which the tax is computed under subsection (A) pay a tax that is two-thirds of the computed amount if three conditions are met together.
The vehicle must be customarily used for one-way haul. Forty-five percent or more of the mileage traveled by the vehicle for a registration year must be mileage traveled empty of all load. And the registrant, owner or operator must have made a sworn application to the department to be classified under the subsection for the registration year, must have given whatever information the department requires to determine eligibility, and the vehicle must actually have been so classified.
That is the shape of pit-to-jobsite work written into a tax statute. A truck that carries stone out and comes back empty is running close to half its annual miles unloaded, which is precisely the pattern the subsection reaches. A one-third reduction across a fleet’s New Mexico mileage is a material number in a haul rate.
The conditions are not self-executing, and that is the part that gets missed. The relief is claimed by sworn application and granted by classification — it does not attach to a truck because the duty cycle qualifies. A fleet that has been running one-way haul for years without applying has been paying the full ladder for those years, and the fix is prospective.
It also has an evidentiary consequence. Establishing that forty-five percent or more of a registration year’s mileage ran empty of all load requires mileage records good enough to survive the audit the department is entitled to run under § 7-15A-9(D). The same records tend to be the ones that answer questions about radius of operation and loaded-versus-empty exposure on a trucking auto liability submission, so the effort is not wasted on the tax alone.
Weighing a New Mexico operation against a neighboring state? The axle limit, the statutory gross tables and the per-mile tax all move together — comparing them one at a time produces the wrong answer.
Section 66-6-4(B) sets registration fees for trucks, truck tractors, road tractors and buses on a declared gross weight ladder, and the ladder does something unexpected at the top. It climbs conventionally from $40 at 001 to 4,000 pounds through $157 at 18,001 to 20,000, $187 at 22,001 to 24,000 and $201 at 24,001 to 26,000. Then the next band — 26,001 to 48,000 pounds — reads $118, and 48,001 and over reads $172.
The heaviest trucks in the schedule pay less at the registration counter than the lightest commercial trucks just below the threshold. That is not an error in the table; it is the weight distance tax taking over. Above twenty-six thousand pounds New Mexico recovers road cost by the mile instead of by the plate, so the plate gets cheaper as the tax begins.
The threshold also switches the basis of registration. Section 66-6-4(D) requires all trucks with a gross vehicle weight of more than twenty-six thousand pounds, and all truck tractors and road tractors used to tow freight trailers, to be registered on the basis of gross combination vehicle weight, while subsection (E) registers trucks at or under twenty-six thousand pounds on gross vehicle weight. Two trucks separated by a few hundred pounds of declared weight are being measured against different things.
Two smaller provisions complete the picture. Subsection (F) charges farm vehicles with a declared gross weight over six thousand pounds two-thirds of the respective fees and issues distinctive registration plates, defining a farm vehicle by the owner’s principal occupation and the vehicle’s principal use and excluding vehicles used for hire. And subsection (G) imposes the annual tire recycling fee of one dollar fifty cents at registration on vehicles subject to a fee under the section, expressly excepting vehicles with a declared gross weight greater than twenty-six thousand pounds.
Plate class follows trip geography rather than vehicle type. The Motor Vehicle Division issues a weight-distance plate to a New Mexico-titled vehicle subject to the tax that travels intrastate, and an International Registration Plan plate to one that travels interstate. The same truck, titled in the same state, carries a different plate class depending on whether it crosses a line — which is a fleet administration fact that shows up whenever a unit is redeployed from local pit work to out-of-state hauling.
Section 66-7-413(A) gives the permit power to the department of transportation and to local highway authorities, in their discretion, on written application and good cause shown. Every permit must be carried in the vehicle to which it refers and opened for inspection to any peace officer, and it is a misdemeanor to violate a condition or term of a special permit. Except for emergency permits, which may run up to one year and must state the route, every permit is issued for a single trip.
The annual instrument sits at subsection (C): except for manufactured home movement, special permits may be issued for a single vehicle or combination for a period not to exceed one year for a fee of two hundred fifty dollars. That permit may allow excessive height, length and width, and may include a provision for excessive weight where the weight of the vehicle or combination is not greater than one hundred forty thousand pounds.
The single trip fee is the one that reveals the architecture. Under subsection (D), a single-trip permit for excessive weight, width, length and height may be issued for a fee of twenty-five dollars plus the product of two and one-half cents for each two thousand pounds in excess of eighty-six thousand four hundred pounds, or major fraction thereof, multiplied by the number of miles to be traveled in New Mexico.
The base is New Mexico’s own statutory table ceiling. An operator who prices a movement off eighty thousand pounds is calculating from a number that does not appear in this section at all, and the error runs in the operator’s favor only until the invoice arrives.
Subsection (K) sets the insurance a private motor carrier must show when requesting an oversize or overweight permit: bodily injury liability of fifty thousand dollars for each person and one hundred thousand dollars for each accident, and property damage liability of twenty-five thousand dollars for each accident. Those are statutory floors for permit issuance and not a commercial program, and they sit well below what a working aggregate fleet would carry — but a certificate has to satisfy them before the permit will issue.
One geographic provision belongs to the border economy and to nobody else. Subsection (N) provides that an applicant for a special permit to operate at a gross weight not exceeding ninety-six thousand pounds within six miles of the port of entry at the border with Mexico at Santa Teresa — or within a mapped circular quadrant running twelve miles north of that port, along a twelve-mile arc to the west through approximately ninety degrees to the international boundary and back east twelve miles to the port — and within twelve miles of other ports of entry on the Mexican border, shall not be required to demonstrate to the department that the load cannot be reduced as a condition of the permit’s issuance. A statute that draws a permit condition as a compass arc is rare, and for aggregate moving into the Santa Teresa industrial corridor it is a live provision rather than a curiosity.
Section 66-7-413.8 authorizes a special multiple-trip permit for what it calls specialized haul vehicles, and the eligibility description is worth reading against a transfer or a heavy tri-axle rather than against a lowboy.
The vehicle must have an overall length of not more than forty feet and contain a group of four to seven axles with a distance between the first and last axle of at least twenty feet but not more than thirty-six feet. Weight on any one axle must not exceed the § 66-7-409 limit. Weight on a tandem axle must not exceed thirty-four thousand pounds, with tandem defined for this purpose as two or more consecutive axles whose centers fall between planes more than forty inches and not more than ninety-six inches apart.
Subsection (D) then supplies the section’s own weight table, computed from the formula W = 500(LN/(N−1) + 12N + 36) and printed as a grid for four, five, six and seven axles across spacings from twenty to thirty-six feet — 55,500 pounds for four axles at twenty feet, 66,000 for six axles at the same spacing, 74,000 for seven axles at twenty-four feet, and 80,000 for seven axles at thirty-four feet and above. The subsection caps the whole table with the words “but in no case greater than eighty thousand pounds.”
A short wheelbase carrying many axles is the configuration a dense material like crushed stone produces, because the body fills by weight long before it fills by volume. That New Mexico wrote a dedicated permit class and a dedicated table for exactly that geometry is a meaningful signal about how the state expects heavy local material to move.
The fee is not in the statute. Subsection (E) requires other requirements to be met as established by rule of the secretary of public safety, “including the payment of a reasonable permit fee,” and the section was enacted by Laws 2015, ch. 49, § 1. Any figure for this permit has to come from the rule rather than from the code, and none is stated here.
Section 7-15A-15(A) requires every weight distance tax taxpayer whose commercial domicile is not in an International Fuel Tax Agreement jurisdiction to file a bond with the department, on a form approved by the attorney general, with a surety authorized by the public regulation commission to transact surety business in New Mexico — the taxpayer as principal obligor, the state as obligee, conditioned on prompt filing of true reports and payment of all taxes, penalties and interest under the act.
Subsection (B) allows cash, or bonds of the United States, New Mexico or any political subdivision of the state, to be filed in lieu of a surety bond.
The amount is set by formula with a floor. Subsection (D) directs the department to require an amount equivalent to the total estimated tax due for two quarters, “provided, however, that the total amount of bond, cash or securities required of a taxpayer shall never be less than five hundred dollars ($500) per motor vehicle on which the weight distance tax is imposed.” Subsection (C) allows the department to increase or reduce the total at any time within the limits the section sets, so the two-quarter figure is a moving target rather than a fixed one.
Note the denominator. Five hundred dollars is a floor per motor vehicle subject to the tax, so it scales directly with fleet size — a twenty-truck out-of-state aggregate operation is looking at a very different figure from a two-truck one, before the two-quarter estimate is even calculated.
There is a way out that rewards a clean filing record. Subsection (H) allows a taxpayer who has not been a delinquent taxpayer under the act for the eight consecutive quarters preceding the request to apply to be exempt from the bond requirement beginning with the first day of the first quarter after that period. The exemption can be terminated if the taxpayer later becomes delinquent, effective no earlier than ten days after written notice.
Sureties can also leave. Subsection (F) discharges a surety from liability accruing after ninety days from the date it files a written request to be released, without releasing liability already accrued or accruing within the ninety-day period, and requires the department to notify the taxpayer to file a new bond before the period expires. Two years of clean quarters is therefore worth more than a good relationship with a surety, and it is worth tracking deliberately.
Section 66-7-411(A) allows a police officer with the New Mexico state police division who has reason to believe a vehicle and load are unlawfully heavy to require the driver to stop and submit to weighing on portable or stationary scales, and to require the vehicle to be driven to the nearest approved scales “if the scales are within five miles.” The same subsection adds a limit that runs the other way: a police officer shall not require a driver to weigh a vehicle on a private scale.
Both halves matter operationally. The five-mile radius bounds how far a stopped truck can be sent, and the private-scale prohibition means a pit scale or a plant scale cannot be commandeered as the measuring instrument in an enforcement action.
On an overweight finding, subsection (B) requires the officer or transportation inspector to direct the driver or owner to unload that portion of the load necessary to bring gross or combination gross weight down to the authorized maximum. Refusing to stop, to submit to weighing, or to unload when directed is a misdemeanor under subsection (C).
Subsection (D) reaches past the driver. A shipper or a person loading the vehicle who intentionally overloads a vehicle that the shipper or loader has reason to believe will travel in that condition on a public highway is guilty of a misdemeanor and is fined in accordance with § 66-8-116.1. In a business where the loader and the hauler are frequently different companies, that is a genuine allocation-of-risk question and it belongs in a haul agreement rather than in a conversation after the citation.
The penalties themselves run as a ladder at § 66-8-116.1, keyed to pounds over: $50.00 for 1,000 to 3,000 pounds, $80.00 for 3,001 to 4,000, $150.00 for 4,001 to 5,000, $250.00 for 5,001 to 6,000, $400.00 for 6,001 to 7,000, $550.00 for 7,001 to 8,000, $700.00 for 8,001 to 9,000, $850.00 for 9,001 to 10,000, and $1,000.00 for more than 10,000 pounds over. The section’s History reads Laws 1989, ch. 319, § 12; 2007, ch. 209, § 13, and the annotation records that the 2007 amendment, effective July 1, 2007, doubled the penalty assessments.
A separate liability provision sits at § 66-7-416. Unreasonable use of a bridge or structure means operating over it otherwise than in accordance with §§ 66-7-401 through 66-7-416, and unreasonable use of an improved highway includes hauling on it when the surface is in a soft or plastic condition and the road has been closed pursuant to law or by order of the state highway department. Subsection (F) makes a violation a misdemeanor punishable by a fine of not less than twenty-five dollars nor more than one hundred dollars, or five to thirty days, or both — and makes the operator and the owner jointly and severally liable to the state, county or municipality for the actual damage caused, collectible by suit, with the vehicle itself subject to attachment to satisfy a judgment. A road-damage claim that can attach the truck is a different kind of exposure from a fine, and it belongs alongside the physical damage conversation rather than after it.
Section 66-7-407(A) states the load-escape duty broadly: no vehicle shall be driven or moved on any highway unless it is so constructed, loaded, secured or covered as to prevent any of its load from dropping, sifting, leaking or otherwise escaping — excepting sand dropped to secure traction, and water or other substances sprinkled on a roadway in cleaning or maintaining it. Subsection (B) requires the load and any covering on it to be securely fastened so that the covering or load cannot become loose, detached or in any manner a hazard to other users of the highway.
The section’s History reads that it was enacted by Laws 1978, ch. 35, § 478 and amended by Laws 1989, ch. 319, § 10, and the annotation records that the 1989 amendment, effective July 1, 1989, inserted the words “secured or covered” into subsection (A). Covering became part of the construction-and-loading standard by amendment rather than by original design.
New Mexico writes the duty by outcome rather than by equipment. It does not specify a tarp type, a freeboard measurement or a body configuration in this section — what it requires is that nothing escape and that whatever is used to prevent escape stay attached. That places the compliance judgment on the operator and makes a spillage event, rather than an equipment inspection, the moment the standard gets tested.
Overhang is specified at § 66-7-406. On a vehicle operated alone, or on the front vehicle of a combination, the load may not extend more than three feet beyond the foremost part; on a vehicle operated alone or the rear vehicle of a combination, not more than seven feet beyond the rear of the bed or body. Where a combination consists of a tractor, semitrailer and trailer, subsection (B) limits rear overhang to two feet on the trailer and semitrailer, with no front overhang at all. The section also provides that for its purposes the foremost part of a front-end loading solid waste collection vehicle includes the front-end loading equipment attached to it.
A caption-level enumeration of §§ 66-7-401 through 66-7-416 turns up commodity-specific permit classes for hay, seed cotton, liquid tanks and implements of husbandry. This page makes no claim about material outside NMSA Chapter 66 Article 7, Chapter 65 and Chapter 7 Article 15A, which are the chapters read for it; New Mexico Administrative Code Title 18 was not opened, and the natural gas and specialized-haul figures that those statutes delegate to rule are for that reason not stated anywhere above.
Section 66-7-415(A) allows local authorities, with respect to streets under their jurisdiction, to prohibit the operation of trucks or other commercial vehicles by ordinance or resolution, or to impose limitations as to size or weight, on designated streets — and it enumerates the grounds. The street must be in an area that is primarily residential, or pass by educational or medical facilities, or not be designed or constructed for heavy weight vehicles. The educational and medical grounds were added by Laws 2015, ch. 48, § 1.
The compiler’s note on that amendment is load-bearing and travels with the date: Laws 2015, ch. 3, § 40 and Laws 2015, ch. 48, § 1 enacted different amendments to the section that can be reconciled, and pursuant to § 12-1-8 NMSA 1978 the later-signed chapter 48 version is the one set out and incorporates both. Chapter 48, § 1 is effective June 19, 2015.
Subsection (B) is the provision an operator should actually plan against, because it makes the ordinance conditional on two acts rather than on its own passage. The local authority must erect and maintain signs designating the ordinance’s provisions at each end of the affected portion of street, and notice must be given in writing to the nearest officer or employee of the New Mexico state police division of the department of public safety authorized to issue special permits. Until both are done, the ordinance is not effective.
A truck route restriction in New Mexico therefore has an audit trail attached to it by statute, and the second condition points at an identifiable person rather than at a filing office. Where a haul route is disputed, whether the notice reached that officer is a question with a checkable answer.
Subsection (C) gives the state transportation commission the same authority over highways under its jurisdiction, by resolution, effective on passage and when signs giving notice are erected on the affected highway, with a copy of all restrictions delivered to the state police division.
Separately, the intrastate authority question resolves cleanly for this class. Section 65-2A-3(H) defines a certificated service exhaustively as one of five things — an ambulance service, a household goods service, a shuttle service, a specialized passenger service or a taxicab service — and § 65-2A-38(E) exempts private carriers from the Motor Carrier Act altogether. Within Chapter 65, Article 2A there is no property class among the certificated services, so an aggregate hauler’s New Mexico obligations run through registration, the weight distance tax and, if it crosses a line, the International Registration Plan, rather than through an intrastate operating certificate.
New Mexico writes reciprocity as an express conditional policy rather than as a bare reference to a national plan. Section 65-1-32 grants vehicles properly registered elsewhere exemption from all or part of New Mexico’s fees, taxes or compensation for unusual use of the highways, and from display requirements — but only on the condition that New Mexico-registered vehicles be granted like privileges or exemptions in the other jurisdiction.
Section 65-1-32.1 requires the director to extend either full reciprocity or proportional registration to qualified fleets from agreement states, and § 65-1-33 empowers the secretary to negotiate those agreements. Where no agreement exists, § 65-1-33(D) lets the director declare the extent of exemptions unilaterally, decided on the basis and recognition of the benefits that accrue to the economy of the state from the uninterrupted flow of commerce.
Subsection (E) then draws a hard line: “Reciprocity shall not exist for fleet vehicles between this state and another jurisdiction which has adopted proportional registration for vehicles subject to this section.” A fleet from a proportional-registration state does not get reciprocity here — it gets proportional registration, which is a different instrument with different paperwork.
The border strip is handled in the tax act rather than in the motor carrier act. Section 7-15A-5(D) exempts from the weight distance tax commercial motor carrier vehicles while operating exclusively within ten miles of a border with Mexico in conjunction with crossing that border. The History records the section as enacted by Laws 1988, ch. 73, § 32 and amended in 2006, with the annotation stating that the 2006 amendment, effective May 17, 2006, added Subsection D.
Two conditions in that sentence do all the work. The operation must be exclusively within ten miles of the border, and it must be in conjunction with crossing it. A truck working a border-area pit whose loads never cross is not inside the exemption, and neither is a truck that crosses but then runs inland. For an operation near a port of entry, the difference between those patterns is a per-mile tax difference across every mile the fleet runs.
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 New Mexico 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 New Mexico 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.
Twenty-one thousand six hundred pounds. NMSA 1978, § 66-7-409(A) sets the gross weight imposed on the highway by the wheels of any one axle at 21,600 pounds and separately caps any one wheel at 11,000 pounds. Subsection (C) adds a limit of 600 pounds for each inch of tire width, taken at the manufacturer’s rating for pneumatic tires and at the flange of the rim for solid and cushion tires. The section’s History closes at 2016, ch. 70, § 2, that amendment effective May 18, 2016.
Not for the general gross weight limits. Section 66-7-410 prints two statutory tables instead — subsection (A) covering axle groups from four to eighteen feet, 34,320 pounds at four feet rising to 45,240 pounds at eighteen, and subsection (B) covering distances greater than eighteen feet, 53,100 pounds at nineteen feet rising to 86,400 pounds at fifty-six feet or over. Distances are measured to the nearest even foot, with an exact one-half rounding up. A separate formula and table appear at § 66-7-413.8 for specialized haul vehicles, capped in no case greater than 80,000 pounds.
It is charged in mills per mile on a 2,000-pound banded ladder under § 7-15A-6(A), running from 14.86 mills per mile at 26,001 to 28,000 pounds to 59.10 mills per mile at 78,001 pounds and over. The section’s History closes at 2026, ch. 4, § 1, and the compiler’s annotation states that the 2026 amendment, effective July 1, 2026, increased each rate in Subsection A by thirty-five percent. Those are the post-increase rates. The tax applies to vehicles with a declared gross weight or gross vehicle weight in excess of 26,000 pounds and is filed quarterly under § 7-15A-9(A).
Section 7-15A-6(B) reduces the tax to two-thirds of the computed amount where three conditions are met together: the vehicle is customarily used for one-way haul; forty-five percent or more of the mileage it travels for a registration year is traveled empty of all load; and the registrant, owner or operator has made a sworn application to the department to be classified under the subsection, supplied whatever information the department requires, and had the vehicle so classified. The relief is claimed by application, not applied automatically.
Because above 26,000 pounds the weight distance tax takes over from the plate. The § 66-6-4(B) ladder climbs to $201 at 24,001 to 26,000 pounds and then reads $118 for 26,001 to 48,000 and $172 for 48,001 and over. The same threshold also switches the basis of registration: § 66-6-4(D) registers trucks over 26,000 pounds, and truck tractors and road tractors towing freight trailers, on gross combination vehicle weight, while § 66-6-4(E) registers those at or under 26,000 pounds on gross vehicle weight.
Not on passage. Section 66-7-415(B) provides that a local ordinance or resolution restricting trucks or imposing size or weight limits is not effective until signs designating its provisions are erected and maintained at each end of the affected portion of street, and written notice has been given to the nearest officer or employee of the New Mexico state police division of the department of public safety authorized to issue special permits. Section 66-7-415(A) also limits the grounds to streets in primarily residential areas, streets passing by educational or medical facilities, and streets not designed or constructed for heavy weight vehicles.
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.
