New Mexico Oversize Permits

Legal size/weight limits, escort thresholds, travel restrictions, and permit office contact for New Mexico.

⚠ REFERENCE ONLY — NOT A PERMIT. VERIFY WITH THE STATE BEFORE YOU TRAVEL.

These figures are a reference summary of publicly published state rules, not a substitute for a state-issued permit and not legal advice. Rules change — always confirm current limits and requirements directly with the state permit office before you plan or run a move. Last verified: 2026-07-16. Oversize Ops is NOT responsible and CANNOT be held liable for decisions made from this reference. Official source ↗

Data confidence: Medium. We could not fully corroborate every figure on this page against a primary official source. Treat these numbers as a starting point and confirm with the permit office before you plan a move.
Escort, travel-time, holiday, height (14 ft), length (65 ft) and 170,000-lb engineering-analysis values verbatim from 18.19.8 NMAC; legal width (102 in) from NMSA 66-7-402. legal_max_gross_lbs (80,000) is the federal standard NM follows. Deep OSOW portal URL and DPS OSOW permit phone not independently verified (used NMDOT permits landing page + MVD Commercial Vehicle Bureau line).

Legal Maximum Dimensions (no permit required)

Width: 8.5ft (102in)
Height: 14ft (168in)
Max semitrailer length: 57.5ft
Max overall combination length: 65ft
Max single-unit vehicle length: 40ft
Gross Weight: 80,000 lbs
Single Axle: 21,600 lbs
Tandem Axle: 34,000 lbs

NMSA 66-7-404 (Height and length of vehicles and loads): a vehicle shall not exceed a height of 14 ft (168 in).

Official source for this height limit →

TWO rows keyed to road class are mandatory here. The 57 ft 6 in semitrailer allowance exists ONLY as a carve-out from the 65 ft overall rule, and ONLY on the Interstate system, STAA-designated federal-aid primary routes, and highways NMDOT designates by rule — where there is then no overall limit. Off the designated network the 65 ft overall reasserts itself, which NO tractor plus 53 ft trailer can meet. ⚠️ New Mexico sets no separate off-network semitrailer limit at all: off-network you are governed solely by the 65 ft overall. That is different from unknown — it does not exist as a distinct number. NM's 40 ft is a SINGLE-UNIT limit, not a trailer limit.

Official source for these length limits →

Escort / Pilot Car Thresholds (see glossary for terms, certification requirements for the driver)

These escort figures are route-dependent — they can change with road classification, lane width, two-lane vs multilane, and time of day. Confirm with the permit office before dispatching.

Front escort required over: 14ft wide
Rear escort required over: 14ft wide
Both escorts required over: 18ft wide
Height escort required over: 16ft tall

Per 18.19.8.81 NMAC, escort vehicle(s) are required for all widths at or exceeding 14 ft (168 in), and may be required below 14 ft depending on route; the number and front/rear position are stipulated on the permit (NM does not set separate front-only vs rear-only width thresholds). Per 18.19.8.83, an escort or a person other than the driver may be required for heights exceeding 16 ft (192 in). Per 18.19.8.82, one escort is required for lengths greater than 110 ft 1 in and two escorts for lengths greater than 120 ft 1 in. Per 18.19.8.84(A), police escorts may be required at DOT discretion for width of 20 ft (240 in) or more. NM's two-escort trigger is length (>120 ft 1 in), not width.

Travel Restrictions

Night travel: Generally restricted
Weekend travel: Generally allowed
Sunday travel: Generally allowed

Per 18.19.8.24(A) NMAC, no movement from 30 minutes after sunset until 30 minutes before sunrise unless continuous movement is specifically authorized on the permit (daylight-only by default). Per 18.19.8.24(B), no movement during inclement weather or on holidays. Metro rush-hour bans per 18.19.8.26: no movement 7-9 a.m. and 4-6 p.m. on major highways in Santa Fe, Las Cruces, Los Lunas and Espanola, and 7-9 a.m. and 4-7 p.m. in Albuquerque and Rio Rancho. No general Saturday or Sunday prohibition.

Holiday blackouts: New Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day, Christmas Day, plus any other holiday designated by the DOT (18.19.8.7(J) / 18.19.8.24(B) NMAC).

See how New Mexico compares to every state ›

Top-Tier Permit Thresholds

This jurisdiction has an equivalent top permit tier under a different name. The figures below are that tier, not a class called "superload".

Width over: 20ft
Length over: 150ft
Weight over: 170,000 lbs

New Mexico's rules do not use the term 'superload.' The analogous threshold is gross weight in excess of 170,000 lbs: per 18.19.8.40 NMAC, such an application must be forwarded to the DOT and no permit is issued unless an engineering analysis of the proposed route has been conducted. Loads 20 ft or more wide may require a police escort at DOT discretion. No superload width/height/length values defined.

Estimated Permit Cost Not available

We could not find a citable, official fee figure for New Mexico — rather than guess, contact the permit office directly (see below) for current pricing.

Permit fee only — does not include escort/pilot-car service costs (market-rate, arranged separately) or third-party permit-service fees. This is an estimate for planning purposes, not a quote.

Get a Permit

Online portal: https://www.dot.nm.gov/business-support/permits/
Phone: 505-827-0392

Planning a move through New Mexico?

Enter your load's exact size to see whether it needs a permit or escort here, plan a truck-legal route, or find a transporter or escort.

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