The same finished traffic light can enter a federally funded project in more than one form. A completed unit delivered to the work site, a head and lens bought separately, and a single-supplier kit may require different Buy America classifications. FHWA’s manufactured products Q&A uses a traffic light as its own example. The useful question for a buyer is: what exactly arrives for permanent incorporation, from whom, and in what state?
This article addresses classification and evidence. For the dates, domestic manufacturing thresholds, and a model-level document request, see our 2026 traffic signal Buy America procurement guide. The funding question comes first; see our BABA versus FHWA applicability check.
FHWA’s starting point: the product brought to the work site
FHWA Q9 says that, apart from kits, a product is classified according to its status when it is brought to the work site for incorporation. FHWA illustrates this with a complete traffic light arriving as a single product, which might be a manufactured product. If the contractor instead buys a traffic signal head and a glass or plastic lens separately from different suppliers and combines them on site, the head might be a manufactured product or an iron or steel product depending on its content, while the separate lens might be a construction material. These are examples, not an automatic classification of every catalog item.
Practical record: retain the bid line, purchase order, supplier identity, bill of materials, shipping documents, delivery condition, and installation scope together. A photograph of the assembled signal after installation cannot show how the articles arrived.
Three delivery scenarios to document
1. A complete signal delivered as one article
Identify the finished article as procured and delivered. Obtain the manufacturer’s classification and supporting manufacturing or component-cost evidence appropriate to the project’s funding and obligation date. A U.S. distributor address or warehouse receipt alone does not demonstrate domestic final assembly. FHWA Q5 explains that packaging or labeling is not, by itself, manufacturing.
2. A head and lens purchased separately
Record each supplier and separate delivery. Ask the project owner which classification applies to each article in its delivered state. The head’s iron or steel content can change its category; the lens’s material and delivered form matter as well. Avoid asking a module vendor for a blanket letter covering a housing, lens, controller, and field assembly that it did not manufacture or supply.
3. A kit from one manufacturer or supplier
FHWA Q10 defines a kit as separate components acquired from a single manufacturer or supplier with the intent to assemble a single product performing a unified function at the work site. A qualifying kit that meets the manufactured-product definition is classified as one manufactured product, even if components travel separately or at different times. Under Q11, the relevant manufacturer is the entity that performs the final manufacturing process producing the kit; the on-site contractor is not made the manufacturer merely by putting it together. Ask for the kit configuration, the point where the supplier brings the components together, and the associated records. An interconnected intersection-wide system is not automatically one kit.
A four-step classification check before requesting certificates
- Confirm the project: identify funding program, project obligation date, owner, and applicable clauses. These determine which rule and phase to assess.
- Map delivery: list each line item and whether it arrives as one finished article, multiple separately procured articles, or a defined single-supplier kit.
- Determine the category: ask the recipient or agency to classify each article using the applicable FHWA rule, including any iron or steel predominance question. ITS cabinets or enclosures can have a specific iron and steel requirement under FHWA Q7.
- Match evidence to that category: request the manufacturer’s dated, model-specific statement and manufacturing or component records required by the selected classification. Archive substitutions and revisions.
For the separate issue of ITE testing, ETL listing, agency product approval, and project acceptance, read five different traffic signal approval questions. Those checks do not establish Buy America status.
Frequently asked questions
Does assembling a signal at the intersection always turn it into a kit?
No. FHWA Q10 describes a kit with a single manufacturer or supplier, separate components, and a unified resulting product. Separately purchased articles can instead be classified separately. Keep the actual procurement and delivery documents.
Is a separate LED module automatically a construction material?
No. The Q9 lens example does not assign every LED module or housing to that category. The responsible agency must classify the specific delivered article against the rule and product definition.
Can a supplier issue one Buy America letter for every configuration?
Only if the letter accurately covers the relevant article, configuration, manufacturing facts, and applicable requirement. A catalog family name or generic country-of-origin line is insufficient to resolve the delivery scenario.
Sources and scope
Primary source: FHWA, Manufactured Products Final Rule Q&A, especially Q5 and Q7–Q11 (accessed September 2026). FHWA explains that its Q&A provides clarification and is not itself binding law. The applicable contract, 23 CFR 635.410, and agency determination govern a specific project. Product illustrations in this post are conceptual.
