Arizona Truck Weight and Size Limits
Legal limits for a truck in Arizona without a permit: Interstate axle and gross weights, height, width, and semitrailer length, each with its official source.
Arizona limits at a glance
| Limit | Arizona | Source |
|---|---|---|
| Interstate gross weight | 80,000 lb | 23 CFR 658.17, Weight (eCFR) |
| Interstate single axle | 20,000 lb | 23 CFR 658.17, Weight (eCFR) |
| Interstate tandem axle | 34,000 lb | 23 CFR 658.17, Weight (eCFR) |
| Width (National Network) | 102 in | 23 CFR 658.15, Width (eCFR) |
| Height | 13 ft 6 in; 14 ft on a designated highway system | Ariz. Rev. Stat. § 28-1094 |
| Semitrailer length | 57 ft 6 in (with a semitrailer over 53 ft, overall length is capped at 65 ft off the National Network and designated highways) | Ariz. Rev. Stat. § 28-1095 |
| Grandfathered semitrailer length | 57 ft 6 in | 23 CFR part 658, Appendix B, Grandfathered Semitrailer Lengths (eCFR) |
Interstate weight limits
Federal law sets the Interstate limits at 20,000 lb on a single axle, 34,000 lb on a tandem, and 80,000 lb gross, with the bridge formula on every axle group (23 CFR 658.17). States may keep higher limits they had before the federal limits took effect ("grandfather rights").
Grandfathered: up to 129,000 lb GVW on I-15 and on US-89, US-160, and US-163 segments listed in 23 CFR 658 Appendix C.
FHWA on Arizona: Arizona has a grandfather provision under Federal law (23 CFR Part 658, Appendix C) to allow vehicles to operate up to 129,000 lbs. GVW on parts of the Interstate system. See the Routes section for a full description of the routes to which this grandfather provision applies.
Bridge formula check with Arizona limits
A 5-axle tractor-trailer is filled in. Change the spacings and weights to match your rig; the limits for single axles, tandems, and gross are Arizona's Interstate limits.
Your result
Arizona limits off the Interstate
FHWA's summary of Arizona law for trucks in regular operation (no permit), including non-Interstate highways. It reflects state law as of October 1, 2012; check the state for later changes.
- Single axle
- 20,000 lbs.
- Tandem axle
- 34,000 lbs.
- Tridem axle
- Per State weight table
- Gross weight
- Per State weight table / 80,000 lbs. (5-axle or more)
Where Arizona allows more than federal limits
- Excess weight up to 1,000 lbs. over State limits, which are consistent with Federal limits, is penalized by a fine of 1 dollar.
Height, width, and length
- Width: 102 inches. States may not set a width limit of more or less than 102 inches on the National Network (23 CFR 658.15(a)). Permits can allow wider loads.
- Height: 13 ft 6 in; 14 ft on a designated highway system. There is no federal height limit; each state sets its own.
- Semitrailer length: 57 ft 6 in (with a semitrailer over 53 ft, overall length is capped at 65 ft off the National Network and designated highways)
- Grandfathered semitrailer length: 57 ft 6 in. The minimum semitrailer length the state must allow in a tractor-semitrailer combination on the National Network, based on lengths legal in the state on December 1, 1982. Federal law also requires at least 48 ft (23 CFR 658.13(b)(1)).
Over these limits you need a permit. Arizona oversize/overweight permits (602-771-2960).
Arizona compared with neighboring states
| State | Gross | Single | Tandem | Height | Semitrailer |
|---|---|---|---|---|---|
| Arizona | 80,000 lb | 20,000 lb | 34,000 lb | 13 ft 6 in | 57 ft 6 in |
| California | 80,000 lb | 20,000 lb | 34,000 lb | 14 ft | 48 ft |
| Colorado | 80,000 lb | 20,000 lb | 36,000 lb | 14 ft 6 in | No separate semitrailer length for a l… |
| Nevada | 80,000 lb | 20,000 lb | 34,000 lb | 14 ft | Pending |
| New Mexico | 86,400 lb | 21,600 lb | 34,200 lb | Pending | Pending |
| Utah | 80,000 lb | 20,000 lb | 34,000 lb | 14 ft | 53 ft |
Sources
Source: 23 CFR 658.17, Weight (eCFR) · Last verified Sep 28, 2026
Source: FHWA, Compilation of Existing State Truck Size and Weight Limit Laws (Report to Congress, May 2015), Appendix A: Arizona · Effective Oct 1, 2012 · Last verified Sep 28, 2026
Source: FHWA, Compilation of Existing State Truck Size and Weight Limit Laws (Report to Congress, May 2015), Appendix B: Summary of State Exceptions to Federal Truck Weight Limits · Effective Oct 1, 2012 · Last verified Sep 28, 2026
Source: 23 CFR 658.15, Width (eCFR) · Last verified Sep 28, 2026
Source: 23 CFR part 658, Appendix B, Grandfathered Semitrailer Lengths (eCFR) · Last verified Sep 28, 2026
Source: Ariz. Rev. Stat. § 28-1095 · Last verified Sep 28, 2026
Source: Ariz. Rev. Stat. § 28-1094 · Last verified Sep 28, 2026
Source: FHWA, Oversize/Overweight Load Permits: State permit contacts · Last verified Sep 28, 2026
Limits change, and cities, counties, and posted bridges can set lower ones. Check with Arizona before you run a load near the limits. Page data last verified Sep 28, 2026.