A federal proposal that agricultural trucking advocates have been pushing for years just cleared a major hurdle. On May 22, 2026, the House Transportation and Infrastructure Committee approved an amendment to the BUILD America 250 Act — H.R. 8870 — that would create a voluntary pilot program allowing states to increase the interstate truck weight limit from the current 80,000 pounds to 91,000 pounds, provided the truck is equipped with a sixth axle.
The broader bill is now headed to a full House vote. Nothing has been signed into law yet. But this is worth watching closely if you operate ag trucking equipment on interstate highways, and we think it’s worth flagging a few things that aren’t getting much attention in the coverage so far.
What the proposal would actually do
Current federal law caps most interstate truck weights at 80,000 pounds on a standard five-axle configuration — a limit that hasn’t been updated since 1982. The amendment, introduced by Rep. Dusty Johnson (R-SD), would establish a voluntary ten-year pilot program under which:
- Participating states could opt in to allow six-axle trucks weighing up to 91,000 pounds on federal interstates
- States that don’t want to participate are not required to — the program is entirely opt-in
- The sixth axle is a requirement, not an option — you can’t just add weight to a five-axle truck
- Existing federal trailer length limits remain unchanged
Washington, Oregon, and Idaho would all be eligible to participate if the program passes. Whether and when each state would actually opt in is a separate question that would play out at the state level.
Why agricultural groups are behind it
Farm and agribusiness groups — including the Soy Transportation Coalition, which has been advocating for this change for years — argue that the efficiency gains for grain and commodity hauling are significant. The case they’re making:
- More payload per trip means fewer total trips to move the same volume of grain, produce, or commodities
- The Soy Transportation Coalition estimates a typical grain elevator could save approximately $44,000 per year in fuel costs by moving to a six-axle configuration at higher weights
- The sixth axle distributes weight over more tires, which backers argue actually reduces per-axle road wear compared to a five-axle truck at 80,000 pounds
- Federal Highway Administration research found that a 91,000-pound six-axle truck can achieve shorter stopping distances than a conventional five-axle truck at 80,000 pounds — the extra braking capacity is a genuine safety argument
At a time when diesel prices remain elevated and driver availability is tighter than it has been in years, the efficiency argument resonates with operations trying to move more product with fewer resources.
Context for PNW operations: Grain hauling in eastern Washington, Oregon, and Idaho involves significant interstate mileage between fields, elevators, and export terminals. If WA, OR, or ID opt into the pilot, the operational math for grain haulers in those states could change meaningfully.
The opposition and why the outcome isn’t certain
The amendment passed committee narrowly, 35 to 29, with opposition largely focused on public safety and infrastructure concerns. Critics, including the Owner-Operator Independent Drivers Association (OOIDA) and several committee members, have argued that heavier trucks increase crash severity, accelerate bridge wear, and shift costs onto states and local governments.
The bill now faces a full House vote and then the Senate before anything becomes law. Given the divided committee vote and the broader legislative calendar, the timeline is uncertain. We’d characterize this as a proposal worth monitoring rather than an imminent change to plan around.
The insurance questions this raises for ag haulers
If this pilot does pass and Pacific Northwest states opt in, there are real insurance questions for operations that choose to participate. A few worth thinking about now:
- Vehicle classification and rating: a six-axle configuration is a different vehicle than a five-axle truck. How your commercial auto policy classifies and rates that vehicle may change. Confirm with your agent before putting a six-axle truck on the road under your existing program.
- Liability limits: a heavier truck carrying more cargo represents a larger potential liability exposure in a serious accident. If you’re operating at 91,000 pounds, it’s worth a conversation about whether your current liability limits are still appropriate.
- Cargo coverage: hauling more per load means the value of cargo in a single trip goes up. Make sure your cargo coverage limit reflects the higher per-load value that a heavier configuration makes possible.
- State compliance: operating at 91,000 pounds in a state that hasn’t opted into the pilot — or on roads not covered by the program — would create both a regulatory and an insurance problem. Route planning and documentation will matter if this moves forward.
Still a proposal: Nothing in this bill has been signed into law. We’re flagging it because the timeline from committee to full House to Senate can move faster than people expect, and the operations that tend to be best positioned are the ones that have already thought through the implications before a change takes effect.
Read more
Agricultural perspective: Higher Truck Weight Limits Could Boost Ag Efficiency Under New Federal Pilot Proposal — RFD-TV, May 29, 2026
Legislative detail: H.R. 8870 — BUILD America 250 Act, 119th Congress — Congress.gov
Industry analysis: House Committee Approves 91,000-Pound Interstate Trucking Pilot — Commercial Carrier Journal, May 2026
We’ll continue to watch this as it moves through Congress. If you have questions about how your current trucking program is structured — or want to think through how a change like this might affect your coverage — the team at Graybeal Group is happy to talk through it.
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