The date that matters is the obligation date, not the bid date, not the notice to proceed. Projects obligated on or after Oct. 1 fall under phase two of FHWA’s Buy America rule for manufactured products.
Phase two adds a component-cost test. U.S.-mined, produced or manufactured components must exceed 55% of the total cost of all components in a manufactured product, on top of the final assembly requirement that took effect a year ago.
What ended here
FHWA’s Manufactured Products General Waiver stood for more than four decades. It exempted manufactured products used on federal-aid highway projects from Buy America entirely, which is why a signal cabinet or a luminaire assembly never got the scrutiny that steel and iron did. The final rule ends it in two phases.
Phase one, for projects obligated on or after Oct. 1, 2025, required final assembly in the United States. That was the easy half. Assembly location is a fact you can point at.
Why 55% is harder than final assembly
Component cost accounting is not a fact you point at. It’s a build of materials with supplier cost data attached, and the supplier who has to produce it often treats that data as confidential. Tier-two and tier-three suppliers are frequently the ones who actually know where a casting or a printed circuit assembly originated.
Contractors will be asked to certify compliance based on documentation they don’t generate. That’s a familiar and uncomfortable position. The practical answer is to push the certification obligation down the supply chain in writing, in the purchase order, before the order goes out.
What to do in the next three weeks
Identify which upcoming jobs will be obligated after Oct. 1, because those are the ones that change. Pull the manufactured-product line items: traffic signals, ITS cabinets, lighting, guardrail end treatments, bearings, precast accessories, anything assembled from multiple components.
Then get written domestic-content statements from suppliers on those items and price the difference. Some products will clear 55% comfortably. Some won’t, and the ones that don’t will either cost more or need a project-specific waiver, which takes time nobody has budgeted.
This lands in a year already crowded with material cost pressure from tariffs on steel and welding inputs. The domestic content rule and the tariff schedule push in the same direction on price, from two different agencies, with no coordination between them.