Other Support Activities for Road Transportation (U.S. NAICS 48849): An Investor's Primer

1. Overview

NAICS 48849 is a NAICS industry (a five-digit code in the North American Industry Classification System, the U.S. government's standard industry taxonomy) covering the businesses that keep road transportation moving without driving the freight or building the road: operating toll roads, bridges, and tunnels; pilot-car/escort services for oversize loads; truck weighing and inspection; independent bus and truck terminals; drive-away vehicle delivery; and street sweeping and highway snow clearing.[1]

This page is a short rollup. NAICS 48849 contains exactly one child industry — the U.S. national industry 488490, which carries the same name. Because there is a single child, this level is economically identical to it: every dollar, firm, and employee counted under 48849 is also counted under 488490. This primer gives the level's own ground-truth federal statistics and orients you; for the full treatment — scope details, the investable universe, how toll concessions and support services actually earn money, regulation, consolidation, and risks — read the 488490 primer, which this page summarizes rather than repeats.

The one idea to carry across from the child: this is a barbell. A handful of capital-heavy, decades-long toll-road concessions worth billions sit at one end; thousands of tiny, labor-based service firms (pilot cars, sweepers, drive-away drivers) averaging about ten employees sit at the other. There is no clean U.S.-listed pure play, and most tolled mileage is run by government authorities that the private-business statistics below do not count.

2. What's inside — and why this level equals its one child

NAICS is a nested hierarchy: each five-digit NAICS industry splits into one or more six-digit national industries. When an industry has just one child, the two codes describe the same activity, and the U.S. Census Bureau publishes the same numbers for both. That is the case here:

So there is nothing "inside" 48849 to allocate across siblings: 100% of the level is the 488490 child. The scope (toll operations, escort/pilot cars, weighing and inspection, terminals, drive-away, sweeping, snow clearing) and the exclusions (motor-vehicle towing → 488410; the trucking itself → 4841; road construction → 2373; fuel retail → 4471) are defined once, at the child level.[1] See the 488490 primer for the full in-scope list and the adjacent-code boundaries.

3. How big it is

These are federal statistics for NAICS 48849 — reported figures for private, payrolled activity, not a market forecast. They are identical to the 488490 figures because it is the same industry.

Read plainly: a small, extremely fragmented, low-wage service industry as officially measured. The average firm books roughly $2.3 million in receipts (2022 receipts ÷ firms), the average establishment employs about ten people, and average pay is roughly $44,600 per worker (2023 payroll ÷ employees) — simple arithmetic on the figures above, not medians.[2][3] The HHI (a 0–10,000 concentration gauge where anything under 1,500 is "unconcentrated") of 172 and a top-four share near 20% make this one of the least concentrated industries in the economy.[2] Because firm counts come from the Economic Census (2022) and establishment/employment from County Business Patterns (2023) — different programs and years — they should not be blended into a single precise margin.

Undercount caveat — large here, and it cuts both ways. The $5.16 billion badly understates the economic activity of road-transport support:

• Government toll operations are excluded. The Economic Census counts private businesses, not public agencies — yet the single biggest activity in this category, running tolled roads, bridges, and tunnels, is mostly done by government authorities. U.S. public toll agencies collect well over $15 billion a year; the New Jersey Turnpike Authority alone took in about $2.13 billion in 2022.[6][7] Almost none appears above.
• One-person operators are largely excluded. County Business Patterns omits businesses with no employees, so many pilot-car, drive-away, and small sweeping outfits that run as non-employer sole proprietors are missed here; the Census Bureau tracks them separately in Nonemployer Statistics.[3][5]

Treat $5.16 billion as the private, payrolled slice, not the size of the road-support economy, which is far larger once government tolling is counted.

4. Where the value concentrates

Because there is one child, the investable map is 488490's map. In brief:

• Enterprise value sits in long-dated toll concessions, held either by foreign-listed operators (Ferrovial, Transurban, Atlas Arteria, VINCI) or private infrastructure funds (IFM, Macquarie, Meridiam).[9][10][11][12][15]
• The nearest listed proxies to the tolling economy are technology/services firms — Verra Mobility and Quarterhill — usually coded outside this NAICS code.[13][14]
• The long tail — pilot cars, sweeping, snow clearing, weighing, terminals — is Main-Street small business, nearly all under the U.S. Small Business Administration (SBA) $18 million size standard.[4]

The 488490 primer carries the full company-by-company table, tickers, and scale figures.

5. How the money works

Two distinct engines, detailed in the child primer:

• Engine A — toll concessions earn essentially traffic × toll rate, with very high margins once the road is built, rates escalating on a Consumer Price Index (CPI, the standard inflation gauge) formula or by dynamic (congestion) pricing, and 30-to-99-year contracts that are heavily debt-financed so returns accrue over decades.[9][19]
• Engine B — support services earn on utilization, per-day/per-mile rates, and subscription revenue (weigh-station bypass runs roughly $15–$20 per truck per month), with labor as the dominant cost and thin margins.[3][17][18]

Competition in Engine A is for the concession at auction; in Engine B it is local and low-barrier.

6. What drives demand

Steady road use rather than a boom. The Federal Highway Administration's (FHWA) Spring 2025 forecast projects total U.S. vehicle miles traveled (VMT) rising about 0.6% a year through 2053, with truck VMT up 0.9–2.0%.[22] Freight and e-commerce volume, commuter congestion (which makes managed lanes valuable), federal hours-of-service rules that force driver stops, energy-transition oversize loads that need escorts, public-infrastructure funding and public-private-partnership (P3) appetite, and weather/clean-water rules for snow and sweeping all feed the layer. See 488490 for detail.[21][22]

7. Regulation

Regulation is set at the activity level, so it is identical to the child's: state Departments of Transportation set oversize-load permitting and pilot-car rules; federal law (Section 129 of Title 23, U.S. Code, and FHWA guidance) limits new tolls on existing free Interstate lanes, which is why new tolling appears mostly as added managed lanes; long-term concession agreements are the real rulebook for toll roads; the Federal Motor Carrier Safety Administration (FMCSA) governs drive-away drivers and weigh-station enforcement; and municipal sweeping is increasingly mandated by clean-water stormwater permits.[7][8][20][21] Full discussion in the 488490 primer.

8. Consolidation

The headline is fragmentation (HHI 172), but code-level averages hide sharp differences: a specific toll bridge or express lane is a decades-long local monopoly, while local sweeping or pilot-car markets are fiercely competitive.[2] Three pockets are consolidating — toll concessions among a small club of global infrastructure sponsors; service niches via private-equity buy-and-build (Sweeping Corporation of America); and tolling technology into a few networks (PrePass, Drivewyze, Bestpass/Fleetworthy, with Quarterhill's agreed purchase of Conduent's tolling business).[14][16][17][18] The through-line: outside concessions, value comes from aggregating small operators, not out-competing them.

9. Risks

The same risks the child details: traffic/demand exposure (early U.S. toll P3s over-forecast traffic and failed); political and regulatory backlash against tolls and congestion pricing; contract and rebid risk; heavy leverage and interest-rate sensitivity; thin-margin, labor-exposed services; currency and liquidity risk on the foreign-listed proxies; cyber/technology shift as tolling goes all-electronic; and measurement risk — the NAICS label alone is a poor guide because it misses nonemployers, government operations, and revenue booked in adjacent codes.[3][7][15]

10. How to invest, and the outlook

There is no U.S.-listed pure play, so exposure is indirect and should be underwritten asset-by-asset, not off a parent's total revenue. Public routes run through foreign-listed toll operators — Ferrovial (Nasdaq: FER), Transurban (ASX: TCL), Atlas Arteria (ASX: ALX), VINCI (Paris: DG) — and tolling-technology names Verra Mobility (Nasdaq: VRRM) and Quarterhill (TSX: QTRH), plus listed-infrastructure funds and index exchange-traded funds (ETFs).[9][10][11][12][13][14] Private routes — where most of the industry lives — run through infrastructure-fund commitments (IFM, Macquarie, Meridiam), private-equity buy-and-builds, and direct Main-Street ownership of pilot-car, sweeping, snow-clearing, weighing, and terminal businesses, nearly all SBA-loan-eligible under the $18 million line.[4][15][16][19]

Outlook: a slow-compounding, infrastructure-flavored activity — durable local monopolies and steady roll-ups rather than fast growth. Tailwinds are outperforming managed lanes with dynamic pricing above inflation and an active IIJA-era P3 pipeline; headwinds are remote-work drag on commuter volumes, high financing costs, and political resistance to new tolls.[9][19][22][23] Underwrite the subsegment, contract, and asset — not the NAICS label.

For the full analysis, see the 488490 primer, of which this page is the single-child rollup.

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Sources

1. U.S. Census Bureau, 2022 NAICS Definition — 488490 Other Support Activities for Road Transportation, 2022. https://www.census.gov/naics/?input=488490&year=2022
2. U.S. Census Bureau, 2022 Economic Census — Concentration and Comparative Statistics, NAICS 488490 (receipts, firms, concentration ratios, HHI), 2022. https://www.census.gov/programs-surveys/economic-census.html
3. U.S. Census Bureau, County Business Patterns 2023, NAICS 488490 (establishments, employment, payroll; excludes nonemployers), 2023. https://www.census.gov/programs-surveys/cbp.html
4. U.S. Small Business Administration, Table of Small Business Size Standards (NAICS 488490 = $18 million), 2023. https://www.sba.gov/document/support-table-size-standards
5. U.S. Census Bureau, Nonemployer Statistics (separate program tracking businesses with no paid employees), 2024. https://www.census.gov/programs-surveys/nonemployer-statistics.html
6. Statista, America's Top-Earning Toll Agencies (New Jersey Turnpike ~$2.13B, 2022; others). https://www.statista.com/chart/3840/americas-top-earning-toll-agencies/
7. Congressional Research Service, Tolling U.S. Highways and Bridges (R44910) (federal tolling limits, concession framework), 2020. https://www.congress.gov/crs-product/R44910
8. U.S. Federal Highway Administration, Federal-Aid Highway Program Guidance — 23 U.S.C. §129 (tolling, private ownership, use of toll revenue), 2016. https://ops-dr.fhwa.dot.gov/freewaymgmt/hovguidance/appb.htm
9. Ferrovial SE, FY2024 Results (Nasdaq listing; managed-lane revenue; I-66 revenue-per-transaction +33%), 2025. https://www.sec.gov/Archives/edgar/data/1468522/000146852225000037/a250227_7xfy24resultsxen.htm
10. Transurban Group, North America — Roads and Projects (495/95/395 Express Lanes), 2026. https://www.transurban.com/roads-and-projects/north-america
11. Atlas Arteria, Company profile (Chicago Skyway 66.67%, Dulles Greenway, APRR). https://en.wikipedia.org/wiki/Atlas_Arteria
12. VINCI, VINCI Highways / Denver Northwest Parkway acquisition, 2024. https://www.vinci.com/en/group/vinci-business-lines/vinci-highways
13. Verra Mobility Corporation, Fourth Quarter and Full Year 2025 Financial Results, 2026. https://ir.verramobility.com/news-releases/news-release-details/verra-mobility-announces-fourth-quarter-and-full-year-2025
14. Conduent / Quarterhill, Quarterhill to Acquire Conduent Tolling Solutions Business ($70M; ~$2B combined backlog), 2026. https://www.prnewswire.com/news-releases/quarterhill-to-acquire-conduent-tolling-solutions-business-302814102.html
15. IFM Investors, IFM Investors completes acquisition of Indiana Toll Road Concession Company (60-year lease, ~$5.7B; with CDPQ), 2021. https://www.ifminvestors.com/news-and-insights/media-centre/ifm-investors-completes-acquisition-of-indiana-toll-road-concession-company/
16. Warburg Pincus, Sweeping Corporation of America (SCA) (largest U.S. power sweeper; buy-and-build), 2020. https://warburgpincus.com/investments/sweeping-corporation-of-america-sca/
17. PrePass, How is the PrePass app different from Drivewyze? (network scale, pricing), 2024. https://prepass.com/faq/prepass-app-different-drivewyze/
18. Drivewyze, Drivewyze PreClear vs. PrePass (coverage: 45 states, ~830 sites), 2024. https://drivewyze.com/resources/drivewyze-vs-prepass-comparison/
19. Moody's Ratings, Privately Managed Toll Roads (managed-lane median revenue +36% 2019–2024), 2024. https://ratings.moodys.com/api/rmc-documents/396217
20. U.S. Federal Highway Administration, Pilot/Escort Vehicle Operators Best Practices Guidelines (FHWA-HOP-16-051), 2016. https://ops.fhwa.dot.gov/publications/fhwahop16051/fhwahop16051.pdf
21. Federal Motor Carrier Safety Administration, Summary of Hours of Service Regulations, 2022. https://www.fmcsa.dot.gov/regulations/hours-service/summary-hours-service-regulations
22. U.S. Federal Highway Administration, Spring 2025 Forecasts of Vehicle Miles Traveled (VMT) (total +0.6%/yr; combination trucks +0.9%/yr; single-unit trucks +2.0%/yr, 2023–2053), 2025. https://www.fhwa.dot.gov/policyinformation/tables/vmt/2025_vmt_forecast_sum.pdf
23. Nixon Peabody LLP, Rethinking toll roads and managed lane projects (Georgia SR 400 Express Lanes P3, ~$4.6B / ~$3.8B concession fee), 2025. https://www.nixonpeabody.com/insights/articles/2025/07/21/moving-on-down-the-road-rethinking-toll-roads-and-managed-lane-projects