Highway, Street, and Bridge Construction (U.S.)

NAICS 2022 code 237310 — an investor's primer

1. Overview

This is the industry that builds and rebuilds America's roads, highways, interchanges, airport runways, and bridges. Its defining feature — the thing to understand first — is that its customer is almost entirely the government. State departments of transportation (DOTs), counties, and cities finance and commission the work; privately held contractors bid for it and earn revenue by executing projects. So owning the infrastructure (a public function) and building it (a private, competitive business) are two very different things, and this primer is about the builders.

That structure means the industry's fortunes track public budgets and federal transportation law, not consumer spending or the housing cycle. It is, in effect, a way to participate in tax dollars being turned into pavement and steel.

Both kinds of investor can get exposure. A public-market investor can buy a small cluster of listed civil contractors, the larger listed materials producers (crushed stone, asphalt, ready-mix concrete) tied to the same demand, or engineering-design firms. A private investor more often owns a local paving-and-materials business, takes equity in toll-road and "managed lane" concessions, or holds the municipal and state bonds that finance the projects. The industry is enormous, extraordinarily fragmented, and — as of 2026 — sitting in the final year of a historic federal funding wave, with the size of the next wave still being fought over in Congress.

2. What it is and how it's structured

Scope. NAICS — the North American Industry Classification System, the standard U.S. statistical agencies use to sort businesses — code 237310 covers establishments primarily engaged in building highways (including elevated), streets, roads, airport runways, public sidewalks, causeways, and bridges: new construction, reconstruction, rehabilitation, and repair. It also captures the specialty road trades: asphalt and concrete paving, resurfacing, pothole filling, guardrail, highway-sign and culvert work, bridge approaches, and traffic-lane painting.[1]

What it excludes (important, because road work is legally split across several codes):

• Water and sewer lines and related structures → NAICS 237110.
• Oil and gas pipelines → NAICS 237120.
• Power and communication lines → NAICS 237130.
• Tunnels → NAICS 237990, Other Heavy and Civil Engineering Construction.
• Highway lighting and traffic-signal installation → NAICS 238210, Electrical Contractors.
• Painting bridges → NAICS 238320, Painting Contractors.
• Removing bridges or culverts, road decommissioning → NAICS 238910, Site Preparation.
• Parking lots, private driveways, sidewalks not on public streets, billboards → NAICS 238990, All Other Specialty Trade Contractors.[1]

Ownership mix. The population is dominated by privately held firms — family-owned and regional paving, grading, and bridge contractors — plus a thin layer of large publicly traded contractors, a separate group of publicly traded materials producers, and the U.S. subsidiaries of global construction groups. A handful of very large private, employee-owned, or foreign-owned firms sit at the top on the biggest, most technical projects. Many of the strongest players are vertically integrated, owning aggregate reserves, quarries, and asphalt plants alongside the contracting business.[2]

3. How big it is

Our federal ground-truth figures for the contractors classified in 237310. (They combine two vintages and two survey universes, so treat them as a profile of the industry, not a single-year market model.)

(SBA is the U.S. Small Business Administration; its size standard is a government-contracting eligibility threshold, not a measure of the industry's size.)

The undercount caveat — read this before quoting the numbers. The $160 billion receipts figure counts what private employer contractors bill; it is not the total the public spends on roads. County Business Patterns (CBP) and the Economic Census concentration data both cover establishments with paid employees, so three gaps matter:

• A large share of routine road work — patching, striping, snow and ice control, minor bridge maintenance — is performed in-house by government maintenance crews (state DOT and county forces). Their labor is public payroll, not industry receipts, so it never shows up.
• Related road work is scattered into the adjacent NAICS codes listed above (tunnels, signals, bridge painting).
• Businesses with no paid employees (very small operators) are largely excluded, and our source file carries no reliable nonemployer estimate, so none is added here.

For scale, total state-and-local spending on highways and roads was about $206 billion in 2021, of which state governments provided roughly three-quarters and federal transfers about a quarter.[6] Separately, the U.S. Census Bureau's monthly measure of highway-and-street construction put in place ran at a seasonally adjusted annual rate of roughly $142–146 billion through 2025.[7] The federal government's own direct construction outlay is tiny by comparison — about $5.4 billion in 2023[6] — because federal money mostly flows through the states, which act as the contracting customer. Bottom line: the private contracting industry is a ~$160 billion business sitting inside a public road-spending system that is larger and mostly government-run.

4. The investable universe

There is no large pure-play highway contractor: the biggest builders are diversified civil contractors, and the biggest listed companies tied to this demand are the materials producers. Tickers and scale are given for context — a map of the landscape, not a recommendation.

Listed contractors (build the roads):

Listed materials producers (sell the aggregates, asphalt, and concrete): these are the largest and most consistently profitable public plays on road demand, because materials are a higher-margin, harder-to-replicate business (see Section 5). Earnings depend more on material prices and volumes than on project execution.

Engineering/design exposure: AECOM (NYSE: ACM) offers indirect exposure through transportation design and program management; it typically benefits earlier in the project cycle than a builder.[16]

Major private / other owners:

• Kiewit — employee-owned, engineering-led, Omaha; one of the top U.S. transportation contractors.[18]
• The Walsh Group — fourth-generation, family-owned; bridge, highway, transit, and public-private-partnership work.[18]
• Bechtel — privately held global engineering-and-construction group with a large infrastructure arm (portfolio extends well beyond roads).[18]
• FlatironDragados — unlisted North American civil-construction group, owned 61.8% by Spain's ACS Group and 38.2% by HOCHTIEF after combining Flatiron and Dragados North America.[17]
• Lane Construction (owned by Italy's Webuild) and Ferrovial (Nasdaq/Euronext: FER), whose U.S. build arm Webber constructs roads while its concessions business owns toll roads and managed lanes.[5]
• Summit Materials, formerly listed, was taken private by Quikrete in 2025.

Below these sit thousands of small regional contractors — the bulk of the 8,901 firms.

5. How the money works

The revenue engine is the public contract. The model is project-based: a public agency defines a project and its funding source; contractors prequalify and bid or submit best-value proposals; the winner performs the work (often with subcontractors and joint-venture partners); revenue is recognized as work progresses, while cash collection depends on billing, inspections, approvals, retainage, and dispute resolution. Two contract families dominate:

• Bid-build (low-bid): the traditional model — the DOT designs the project, contractors bid a fixed price, low bid wins. Margins are thin and the contractor carries the risk that its costs come in higher than its bid.
• Alternative delivery (design-build, CMGC, best-value): the contractor helps design the job and is chosen on value, not just price, often under cost-plus or guaranteed-maximum-price terms. (CMGC = construction manager/general contractor.) These shift risk back toward the owner and make margins more predictable, which is why larger contractors are steering backlog toward them.[8] Fixed-unit-price, time-and-materials, and cost-reimbursable forms also appear.

Margins are genuinely thin. Even a best-in-class contractor runs a construction-segment gross margin in the mid-teens (Granite reported ~15.7% in a recent year), and net margins across the industry sit in the low-to-mid single digits.[8] This is a volume-and-execution business. Fixed-price work offers revenue visibility but leaves the contractor exposed to labor, weather, design, productivity, and material-cost overruns.

Backlog is the key operating metric. Watch book-to-bill (new awards versus revenue burned) and reported backlog — Granite calls its version "Committed and Awarded Projects," which reached a record ~$7.0 billion, up ~32% year over year.[8] Rising backlog signals future revenue; it is the closest thing this industry has to "same-store sales." Alongside it, investors track gross margin by project type, change orders and claims, unfavorable estimate revisions, unbilled receivables and cash conversion, retainage and working-capital needs, bonding capacity and leverage, and public-sector revenue mix and geographic concentration.

The real profit pool is materials and vertical integration. Aggregates — crushed stone, sand, and gravel — are cheap per ton but expensive to haul, so pricing is local and a permitted quarry near a growing metro is a durable competitive advantage that regulators rarely let competitors replicate. Contractors that own their own quarries, asphalt plants, and ready-mix plants (Granite, Knife River) lower their input costs and steady their gross margins by an estimated 150–250 basis points versus peers who must buy materials.[8] For the pure materials producers (Vulcan, Martin Marietta), aggregates are the business — roughly 70% of Martin Marietta's sales — and their permitted reserves are the moat.[13][14]

Watch the cost side. Because so much work is fixed-price, the contractor eats input inflation: liquid asphalt/bitumen (a petroleum product), cement, steel, diesel fuel, and labor. Other realities: heavy surety bonding requirements, retainage (the owner holds back a slice of each payment until completion), and pronounced seasonality — most paving happens in warm, dry months. Notably, the Bureau of Labor Statistics (BLS) reports that labor productivity in NAICS 237310 fell each year from 2021 through 2024; in 2024, output dropped 3.7% while hours worked rose 2.1%.[19] For this industry, crew productivity and project execution — not factory utilization — are the capacity indicators that matter.

6. What drives demand

• Federal transportation law — the single biggest driver. The Infrastructure Investment and Jobs Act (IIJA, 2021), also called the Bipartisan Infrastructure Law (BIL), authorized roughly $550 billion in new federal infrastructure investment over fiscal years 2022–2026 across all sectors.[21] Of that, about $350 billion went to federal highway programs, and the law transferred $118 billion of general-fund money into the Highway Trust Fund to keep it solvent.[20] 2026 is the final year of that authorization.
• The Highway Trust Fund (HTF) and fuel taxes. Federal road money is supposed to come from the HTF, funded by fuel taxes of 18.4 cents per gallon on gasoline and 24.4 cents on diesel — rates unchanged since 1993.[26] Because the tax is a flat per-gallon charge that never rose with inflation or fuel efficiency, HTF outlays have exceeded its revenues every year since 2008, forcing repeated transfers from general tax revenue.[26] This structural shortfall is the fault line under the whole industry.
• Dedicated bridge money. IIJA's Bridge Formula Program (BFP) provides $5.5 billion a year for FY2022–2026 for bridge replacement, rehabilitation, preservation, and protection,[22] and the competitive Bridge Investment Program (BIP) adds further grants with activity continuing through FY2026.[23]
• Asset condition and the repair backlog. The Federal Highway Administration's (FHWA) 2025 National Bridge Inventory (NBI) counts 624,193 highway bridges, of which 41,685 are rated in poor condition.[24] ARTBA's broader read of the same inventory — counting spans that need major repair or replacement, not just the strict "poor" rating — puts it at about 35% of U.S. bridges, over 222,000 spans, a multi-decade source of work.[25] Repair and rehabilitation is generally less discretionary than building new corridors.
• State and local funding. States and localities supply roughly three-quarters of road dollars, via their own fuel taxes, vehicle fees, sales taxes, general funds, municipal bonds, and voter-approved measures. In 2025, voters approved 82% of 283 transportation funding measures, generating an estimated $24 billion.[27]
• Economic and demographic growth. Sunbelt population shifts, freight and port volumes, congestion, and new development (housing, warehouses, data centers) pull road, interchange, and aggregates demand along with them.
• Resilience and modernization. Flooding, extreme weather, seismic upgrades, safety improvements, and electric-vehicle (EV) infrastructure can expand the scope of transportation spending.

7. Regulation

Federal money comes with strings that shape costs and who can bid:

• Davis-Bacon Act (1931): contractors on federal or federally assisted road work above $2,000 must pay locally prevailing wages and fringe benefits (this applies to Bridge Formula Program projects and federal-aid work generally), raising labor costs relative to unregulated private work.[28]
• Build America, Buy America (BABA) / Buy America: federally funded projects generally require domestically produced iron, steel, and manufactured construction materials permanently incorporated into the work.[29]
• DBE goals: projects carry Disadvantaged Business Enterprise participation targets, steering a share of work to qualifying subcontractors.
• Environmental review and permitting: federal-aid projects run through review under the National Environmental Policy Act (NEPA) — alternatives analysis, public involvement, mitigation, interagency consultation[30] — and, where construction disturbs at least one acre, generally need stormwater-permit coverage under the Environmental Protection Agency's (EPA) National Pollutant Discharge Elimination System (NPDES).[31] Quarry permitting is a gating factor for materials supply.
• Oversight and qualification: the FHWA oversees federal-aid work; state DOTs run contractor prequalification, bonding, and licensing; OSHA and work-zone safety rules govern the job site.

Permitting, right-of-way acquisition, utility relocation, local opposition, and litigation can delay project starts. Regulation raises compliance costs but also creates barriers to entry that favor larger, established firms.

8. Competitive dynamics and consolidation

By the federal numbers this is one of the most fragmented industries in the economy. The top four firms hold just 5.4% of receipts (CR4); the top eight 9.0% (CR8); the top fifty 26.8% (CR50); and the Herfindahl-Hirschman Index (HHI) — a standard concentration gauge where 10,000 is a monopoly — is only 19.6, essentially "no concentration."[2] With 8,901 firms and an SBA small-business threshold of $45 million, the median competitor is a local outfit.

The reason is physics and geography: asphalt and ready-mix concrete perish or set within a short haul, and aggregates are too heavy to ship far economically. Competition is therefore local — a contest of who owns the nearest permitted quarry and asphalt plant, who has bonding capacity, who can self-perform difficult work and manage design-build procurement and joint ventures, and who has the DOT relationships and prequalification standing. The largest, most complex projects are meaningfully more concentrated among the few contractors that can do all of that.

Consolidation is happening, mostly on the materials side. The durable strategy is rolling up local aggregates and paving businesses into regional platforms — the playbook behind Construction Partners' rapid growth,[10] Knife River's steady acquisitions,[15] Granite's materials-led deals,[8] and the aggregates giants Vulcan and Martin Marietta. On the heavy-civil side, Flatiron and Dragados combined their North American operations to gain scale.[17] But local execution stays decisive, so this is unlikely to become a national oligopoly; the barriers to entry are real but local (permitted reserves regulators won't readily re-issue, surety bonding, prequalification).

9. Risks

• Funding cliff / reauthorization risk. IIJA authority expires September 30, 2026. Congress must pass a new multi-year bill or a stopgap; the House Transportation and Infrastructure Committee has advanced a roughly $580 billion, five-year proposal (the BUILD America 250 Act), but a five-year bill starting in FY2027 faces a projected $166 billion gap between HTF revenues and outlays.[32] How that gap is closed — higher fuel taxes, new EV/mileage fees, or more general-fund transfers — is the industry's central uncertainty (forward-looking).
• Execution and contract risk. A low bid, design error, productivity shortfall, or geotechnical surprise can erase a project's margin; claims, arbitration, liquidated damages, and unfavorable change-order settlements produce large earnings swings. Because much work is fixed-price, spikes in asphalt, cement, steel, diesel, or wages can turn a job unprofitable.
• Political and budget cycles. Government shutdowns, delayed state budgets, and shifting administration priorities can stall lettings and slow payments.
• Labor shortages. Skilled-trade and heavy-equipment labor is scarce and aging, and measured productivity has been falling.
• Cash-flow, bonding, and leverage risk. Retainage, unbilled costs, and disputes tie up capital; insufficient bonding limits bidding, while excessive leverage magnifies downturns.
• Customer concentration. Dependence on one state, agency, or megaproject increases volatility.
• Weather and seasonality. Wet or cold seasons and extreme-weather events disrupt paving and hurt quarterly results.
• Long-term fuel-tax erosion. As vehicles get more efficient and EV adoption grows, per-gallon fuel taxes collect less per mile driven, deepening the HTF's structural shortfall over time (forward-looking).
• Data risk. Employer-based federal statistics do not capture the full public-sector or nonemployer footprint (Section 3).

10. How to invest and the outlook

Public-market routes. There is no pure highway ETF (exchange-traded fund), but exposure comes several ways: (1) the listed contractors (GVA, TPC, ROAD, STRL) — direct but lower-margin and project-lumpy; (2) the listed materials producers (VMC, MLM, KNF) — the higher-margin, more consistent way to own road demand, driven by local aggregates pricing power; (3) engineering/design names such as AECOM (ACM), which benefit earlier in the cycle; and (4) broad U.S. infrastructure ETFs (for example, the Global X U.S. Infrastructure Development ETF, ticker PAVE), which bundle contractors, materials, and equipment makers. When sizing a contractor position, examine backlog quality — expected margins, project duration, customer funding, contract type, change-order history, cash conversion — not just backlog size, and compare enterprise value with normalized EBITDA (earnings before interest, taxes, depreciation, and amortization) rather than valuing unprofitable backlog as if it were cash. Specific valuation, dividend, and multiple decisions belong at the individual-name level and are beyond this primer.

Private-market routes. Buy or build a local paving-and-materials business — the fragmentation that frustrates index investors is exactly what makes roll-ups attractive to private buyers; favor targets with repeat public customers, scarce local reserves or materials integration, clean safety and claims records, and conservative bonding. Take equity in concessions — toll roads and managed lanes financed through public-private partnerships (P3s), typically via infrastructure funds — but treat this as a distinct asset-ownership strategy, not NAICS 237310 contractor exposure. Or hold the debt: much of this work is ultimately financed by municipal and state bonds, a fixed-income way to participate.

Near-term outlook (forward-looking). The setup for 2026 is strong on paper: ARTBA projects the total U.S. transportation-construction market to grow about 3% to a record $209.1 billion, with public highway, street, bridge, and tunnel work at roughly $145.5 billion, near record levels in the final year of IIJA funding.[33] Backlogs at the major contractors are at or near records, and obligation-and-spending windows extend beyond the authorization years. The swing factor is what comes after IIJA: a clean, well-funded reauthorization would extend the boom into the late 2020s, while a lapse into short-term extensions or a failure to fix the Highway Trust Fund would stall lettings and pressure the whole chain. Within that, maintenance, bridge rehabilitation, freight corridors, and safety work should prove more durable than speculative greenfield megaprojects; for materials producers, local pricing power offers some insulation; for fixed-price contractors, funding certainty and input costs are everything.

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Sources

1. U.S. Census Bureau / NAICS Association, "NAICS Code 237310 — Highway, Street, and Bridge Construction" (2022 definition and cross-references to 237110/237120/237130/237990/238210/238320/238910/238990). https://www.naics.com/naics-code-description/?code=237310; Census profile: https://data.census.gov/profile/237310
2. U.S. Census Bureau, 2022 Economic Census — Concentration by Largest Firms (NAICS 237310: receipts $160.3B; 8,901 firms; CR4 5.4%, CR8 9.0%, CR20 16.9%, CR50 26.8%; HHI 19.6). https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN?codeset=naics~237310&y=2022
3. U.S. Census Bureau, County Business Patterns 2023 (NAICS 237310: 9,256 establishments; 314,940 employees; $31.0B annual payroll; $5.98B Q1 payroll). https://www.census.gov/programs-surveys/cbp.html
4. U.S. Small Business Administration, Table of Small Business Size Standards (NAICS 237310: $45M average annual receipts). https://www.sba.gov/document/support-table-size-standards
5. Engineering News-Record, "ENR Top Contractors" and Ferrovial/Webber and Lane/Webuild coverage (2025–2026). https://www.enr.com/keywords/2840-highway-construction
6. Urban Institute, "Highway and Road Expenditures" (state/local spending ~$206B in 2021; states ~three-quarters, federal ~one-quarter; federal direct construction ~$5.4B in 2023) (2024). https://www.urban.org/policy-centers/cross-center-initiatives/state-and-local-finance-initiative/state-and-local-backgrounders/highway-and-road-expenditures
7. U.S. Census Bureau, Monthly Construction Spending (C30) — Highway and Street, seasonally adjusted annual rate (2025). https://www.census.gov/construction/c30/c30index.html
8. Granite Construction — StockAnalysis "GVA Revenue" (FY2025 ~$4.4B) https://stockanalysis.com/stocks/gva/; Granite Q4 2025 slides (Committed and Awarded Projects ~$7.0B, +32%; construction gross margin ~15.7%; ~100 quarries / 40 asphalt plants; ENR #1 Highways) https://www.investing.com/news/company-news/granite-construction-q4-2025-slides-record-backlog-and-materials-growth-drive-outperformance-93CH-4503725; SEC 2025 Annual Report https://www.sec.gov/Archives/edgar/data/861459/000086145926000014/a2025annualreport.htm
9. Tutor Perini Corporation, "Full Year 2025 Results" (revenue ~$5.5B, +28%) (2026); SEC 10-K https://www.sec.gov/Archives/edgar/data/77543/000007754326000028/tpc-20251231.htm
10. Construction Partners, Inc., "Fiscal 2025 Full Year Results" (revenue ~$2.81B, +54.2%; backlog ~$2.94B) (2025); SEC 10-K https://www.sec.gov/Archives/edgar/data/1718227/000162828026006228/road-20251231.htm
11. Sterling Infrastructure — CompaniesMarketCap "STRL Revenue" (FY2025 ~$2.49B) https://companiesmarketcap.com/sterling-construction/revenue/; SEC 10-K https://www.sec.gov/Archives/edgar/data/874238/000087423826000024/strl-20251231.htm
12. MasTec — StockAnalysis "MTZ Revenue" (FY2025 ~$14.3B). https://stockanalysis.com/stocks/mtz/revenue/
13. Martin Marietta, "2025 Results" (record revenue ~$6.15B; aggregates ~70% of sales) (2026); SEC 10-K https://www.sec.gov/Archives/edgar/data/916076/000119312526059193/mlm-20251231.htm
14. U.S. Securities and Exchange Commission, Vulcan Materials Co. Form 10-K FY2025 (largest U.S. aggregates producer). https://www.sec.gov/Archives/edgar/data/1396009/000162828026009546/vmc-20251231.htm
15. U.S. Securities and Exchange Commission, Knife River Corp. Form 10-K FY2025 (spun from MDU 2023; 208 aggregate sites, 135 ready-mix and 55 asphalt plants across 14 states). https://www.sec.gov/Archives/edgar/data/1955520/000195552026000003/knf-20251231.htm
16. U.S. Securities and Exchange Commission, AECOM Form 10-K FY2025 (transportation design and program management). https://www.sec.gov/Archives/edgar/data/868857/000086885725000013/acm-20250930.htm
17. HOCHTIEF, "Integration of Flatiron and Dragados North America Civil Construction Businesses" (unlisted; 61.8% ACS Group / 38.2% HOCHTIEF) (2024). https://www.hochtief.com/news-media/press-releases/press-release/integration-of-flatiron-and-dragados-north-america-civil-construction-businesses-to-create-value-for-hochtief-and-acs
18. Company pages — Kiewit (employee-owned transportation contractor) https://www.kiewit.com/about-us/; The Walsh Group https://www.walshgroup.com/ourcompany.html; Bechtel https://www.bechtel.com/impact/financials/ (2024–2026).
19. U.S. Bureau of Labor Statistics, "Construction Labor Productivity" (NAICS 237310 labor productivity fell 2021–2024; 2024 output −3.7%, hours +2.1%) (2025). https://www.bls.gov/productivity/highlights/construction-labor-productivity.htm
20. Congressional Research Service, "Funding and Financing Highways and Public Transportation Under the IIJA" (R47573) (~$350B federal highway programs FY2022–2026; $118B HTF general-fund transfer) (2023). https://www.congress.gov/crs-product/R47573
21. Federal Highway Administration, "Infrastructure Investment and Jobs Act" overview (~$550B new federal infrastructure investment FY2022–2026) (2026). https://ops.fhwa.dot.gov/infrastructure-investment-and-jobs-act/
22. Federal Highway Administration, "Bridge Formula Program Implementation Guidance" ($5.5B/year FY2022–2026) (2022). https://www.fhwa.dot.gov/bridge/20220114.cfm
23. Federal Highway Administration, "Bridge Investment Program" (competitive grants through FY2026) (2026). https://www.fhwa.dot.gov/bridge/bip/
24. Federal Highway Administration, "2025 — Bridge Condition by Highway System," National Bridge Inventory (624,193 bridges; 41,685 rated poor) (2025). https://www.fhwa.dot.gov/bridge/nbi/no10/condition25.cfm
25. ARTBA / Short Span Steel Bridges, "Bridge Construction Expected to be Strong in 2026" (2025 NBI: ~35% of bridges / 222,000+ spans need major repair or replacement) (2026). https://www.shortspansteelbridges.org/bridge-construction-expected-to-be-strong-in-2026-says-artba/
26. Wikipedia, "Highway Trust Fund" (fuel tax 18.4¢ gasoline / 24.4¢ diesel unchanged since 1993; outlays exceed revenues since 2008) (2025). https://en.wikipedia.org/wiki/Highway_Trust_Fund
27. ARTBA, "Strong Start for 2025" (2025 ballot measures: 82% of 283 approved, ~$24B) (2025). https://www.shortspansteelbridges.org/strong-start-for-2025-highway-and-bridge-contracts-surge-18-to-22-2b/
28. Federal Highway Administration, "Davis-Bacon (Payment of Prevailing Wage Rates)" and U.S. Department of Labor Fact Sheet #66 (prevailing wage on federal-aid contracts over $2,000) (2024). https://www.fhwa.dot.gov/construction/cqit/dbacon.cfm
29. Federal Highway Administration, "Build America, Buy America Act Q&As" (2025). https://www.fhwa.dot.gov/construction/contracts/buyam_qa_baba_post10232023.cfm
30. Federal Highway Administration, "Environmental Review Toolkit" (NEPA) (2026). https://www.environment.fhwa.dot.gov/about/about.aspx
31. U.S. Environmental Protection Agency, "Stormwater Discharges from Construction Activities" (NPDES permit coverage for disturbances ≥1 acre) (2026). https://www.epa.gov/npdes/stormwater-discharges-construction-activities
32. Bipartisan Policy Center, "How IIJA's Funding Structure Complicates Surface Transportation Reauthorization" and Akin, "Massive Multi-Year Federal Transportation Bills Slated for Committee Action" (IIJA expires Sept 30, 2026; ~$580B House proposal; ~$166B projected HTF gap for a five-year bill from FY2027) (2026). https://bipartisanpolicy.org/explainer/how-iijas-funding-structure-complicates-surface-transportation-reauthorization/
33. ARTBA, "Market Activity to Remain Healthy in 2026, ARTBA Outlook Shows" (total transportation-construction market ~$209.1B in 2026, +3%; public highway/street + bridge/tunnel ~$145.5B) (2026). https://www.artba.org/news/market-activity-to-remain-healthy-in-2026-artba-outlook-shows/