AZ state page · Last reviewed 2026-05-25
Arizona Truck Weight Limits and Permit Sources Arizona truck weight and permit reference using FHWA weight data and ADOT oversize/overweight permit sources.
This page is a reference aid, not legal advice. Weight rules, permits, routes,
and penalties can change without notice; use the linked official source as the
final authority.
At-a-glance summary Field Value Source Status Confidence Gross Federal Interstate gross limit is 80,000 lb; Arizona-specific limits are in the FHWA state law compilation linked here. inferred from official source medium Single axle Federal Interstate single-axle limit is 20,000 lb; Arizona-specific limits are in the FHWA state law compilation linked here. inferred from official source medium Tandem axle Federal Interstate tandem limit is 34,000 lb; Arizona-specific limits are in the FHWA state law compilation linked here. inferred from official source medium Bridge formula Federal bridge formula checks apply on Interstate routes; verify state exceptions and permit conditions before movement. inferred from official source medium Permit agency Arizona Department of Transportation confirmed high Seasonal / frost No official statewide seasonal or frost weight restriction was confirmed during this review. No confirmed official source Needs official confirmation
not found in official review low Fine source Arizona's official overweight assessment source is ARS section 28-5438; the actual amount depends on the citation and excess weight facts. confirmed medium
Field-level reference data Regular weight limits Gross vehicle weight limit Federal Interstate gross limit is 80,000 lb; Arizona-specific limits are in the FHWA state law compilation linked here. inferred from official source medium Single axle limit Federal Interstate single-axle limit is 20,000 lb; Arizona-specific limits are in the FHWA state law compilation linked here. inferred from official source medium Tandem axle limit Federal Interstate tandem limit is 34,000 lb; Arizona-specific limits are in the FHWA state law compilation linked here. inferred from official source medium Bridge formula applies Federal bridge formula checks apply on Interstate routes; verify state exceptions and permit conditions before movement. inferred from official source medium Interstate notes Use FHWA Interstate limits together with the state source and any permit conditions. inferred from official source medium Non-Interstate notes Use the reviewed state source and local postings for non-Interstate operation. inferred from official source medium
Axle and loading notes Steer axle notes Steer axle review should include axle law, tire/equipment ratings, registration, and route postings. inferred from official source medium Drive axle notes Drive axle groups should be checked against tandem/group limits and permit terms. inferred from official source medium Trailer tandem notes Trailer tandem position changes distribution and may affect spacing-sensitive checks; re-weigh after adjustment. inferred from official source medium Fifth wheel notes Fifth-wheel movement redistributes weight but does not create permit authority. inferred from official source medium Bridge law notes Check FHWA bridge formula and the state source when axle spacing is close to a limit. inferred from official source medium
Oversize / overweight permits Permit agency Arizona Department of Transportation confirmed high Permit office name ADOT Oversize/Overweight Permits confirmed high Official permit URL ADOT oversize/overweight permits page. confirmed high Online permit portal Use ADOT's permit page for the current online filing path. inferred from official source medium Permit contact Use ADOT contact links on the official permit page. inferred from official source medium Permit notes Permit terms, route conditions, dates, and vehicle configuration should be checked on the official permit source before travel. inferred from official source medium
Seasonal and special restrictions Frost / seasonal restriction No official statewide seasonal or frost weight restriction was confirmed during this review. No confirmed official source Needs official confirmation
not found in official review low Seasonal weight notes Local route, bridge, or permit restrictions may still apply; no statewide seasonal weight restriction was confirmed in this review. No confirmed official source Needs official confirmation
not found in official review low Official seasonal URL No confirmed official source Needs official confirmation
not found in official review low
Fines and enforcement Overweight fine structure Arizona's official overweight assessment source is ARS section 28-5438; the actual amount depends on the citation and excess weight facts. confirmed medium Overweight ticket notes Use ARS section 28-5438 with the issued citation and permit record before estimating any penalty. inferred from official source medium Enforcement agency Arizona Department of Public Safety Commercial Vehicle Enforcement confirmed medium Fine official URL Official fine or penalty source linked in Sources. confirmed medium CSA / safety notes CSA impact depends on inspection and reporting; use FMCSA SMS materials and the actual inspection record. inferred from official source medium
Scale notes Public scale notes A public scale ticket is a self-check record, not state permit authority. inferred from official source medium Weigh station / enforcement notes Compare scale readings with official limits, route postings, and any permit terms. inferred from official source medium CAT Scale disclaimer CAT Scale tickets are private self-check records and do not replace official permits or enforcement decisions. inferred from official source medium Scale ticket notes Use steer, drive, trailer, and gross readings to compare against official limits before travel. inferred from official source medium
Arizona’s I-10 (Phoenix to El Paso and Los Angeles) and I-40 (Flagstaff east and west) are major transcontinental truck corridors. ADOT administers oversize and overweight permits; tribal land routes that intersect with state highways require separate attention because tribal authorities control access and may have independent weight rules not captured by state sources. Summer heat on Arizona highways is an operational factor for tire condition and load distribution on extended hauls through the desert southwest.
How to verify this yourself
Start with ADOT’s permit page for any over-legal movement. For routes crossing tribal land, verify access authority with the applicable tribal authority separately. Confirm regular axle and gross figures against current Arizona legal materials.
FAQ Where should I verify Arizona permit requirements? Use the official ADOT Oversize/Overweight Permits source linked on this page before moving over legal size or weight.
Are Arizona seasonal restrictions fully confirmed here? No. This review did not confirm a statewide seasonal or frost source, so route and permit restrictions still need checking.
Do these weight figures apply to Arizona state routes and US highways? The values shown are the federal Interstate baseline. State-specific non-Interstate limits are in the FHWA state law compilation linked here and may differ from the baseline.