For businesses · 5 min read · Updated August 2026

What is out-of-home advertising? A plain-English guide for small business

Out-of-home (OOH) is any ad people see outside their home — billboards, transit, digital screens, and vehicles. US OOH hit $9.46B in 2025, still growing.

Out-of-home advertising (OOH) is any paid advertising a person sees away from home — billboards, bus and transit ads, digital screens in public places, mobile billboard trucks, taxi-top ads, and advertising on personal vehicles. It's the oldest advertising category and, according to the Out of Home Advertising Association of America (OAAA), the only traditional medium still growing: US OOH spending hit a record $9.46 billion in 2025, up 3.6% and marking 19 straight quarters of growth, while linear TV, radio, and print all declined.

What formats count as out-of-home advertising?

• Static billboards — large fixed panels on highways or main roads
• Digital billboards / digital out-of-home (DOOH) — screen-based billboards, now about 36% of all US OOH spend and growing 10.5% a year (OAAA, 2026)
• Transit advertising — bus wraps, bus shelters, and street furniture
• Mobile billboard trucks — vehicles built specifically to carry a rolling ad panel
• Taxi and rideshare-top ads — small panels mounted on cab or rideshare vehicle roofs
• Vehicle advertising — decals or wraps applied to everyday personal vehicles that were already driving before the ad went on

The last category is the newest and least understood. It covers everything from a full vehicle wrap sold to a national brand down to a small removable decal a local resident puts on their own car door — a model Lunar (lunarcar.me) runs as a car advertising marketplace in Vancouver, BC and Tulsa, OK.

How much does out-of-home advertising cost?

Cost varies enormously by format, and it's usually quoted as CPM — cost per thousand impressions, the standard way media buyers compare ad formats regardless of size or medium. Media-buyer sourced ranges for the US market, treated as directional:

• Static billboard: roughly $1,500–$30,000+/month · CPM ~$3–$10
• Digital billboard / DOOH: higher upfront cost · CPM ~$20–$25
• Full bus wrap: roughly $6,000–$12,000/month · CPM ~$3
• Bus shelter / street furniture: below billboard pricing · CPM under $3.50
• Mobile billboard truck: roughly $800–$5,000/day · CPM ~$1–$6
• Taxi/rideshare-top: roughly $300–$800/vehicle per 4 weeks
• Overall outdoor CPM sits around $3–$8, compared with roughly $45 for primetime TV

The pattern across formats: OOH as a category is one of the cheapest ways to reach people per view, and vehicle-based formats sit at the low end of that already-cheap category — well below TV, and generally below a static billboard.

Why is OOH growing while other traditional media shrink?

Two forces are driving it, according to OAAA data: digital screens are expanding what OOH can do (targeting, dayparting, dynamic creative), and OOH remains fundamentally local — about 65% of US OOH spending is local, versus 35% national (OAAA, 2024). That local skew matters for a small business: most OOH inventory historically priced for national brands (a highway billboard, a full bus wrap) is now being unbundled into smaller, cheaper local formats, including vehicle decals, that a $500–$2,000/month budget can actually afford. Analysts at eMarketer forecast US OOH topping $10 billion by 2027.

How is out-of-home different from digital advertising?

Digital ads (search, social, display) are bought and served online and can be precisely tracked click by click, but budgets are often outbid by larger competitors and impressions vanish the moment someone scrolls past. OOH is physical: a billboard, a bus, or a car is seen by whoever passes it, whether or not they're online, and it's still there tomorrow. Neither format guarantees a sale — OOH impressions are always estimates, modeled the same way TV ratings and web traffic are, never a literal headcount of eyeballs.

Where does car advertising fit into out-of-home?

Car or vehicle advertising is the OOH category built on personal vehicles that were already on the road — as opposed to a fleet of trucks purpose-built to carry ads. A resident's car passes through the same streets, parking lots, and school pickups it always did; a decal on the door just means a local business is visible every time it does. Because the vehicle isn't a dedicated ad truck, the cost to the business is lower than a mobile billboard truck, and because it's a real resident's car rather than a rented panel, the audience is hyper-local by default — the driver lives, works, and shops in the area the business is trying to reach.

What should a small business look for in an OOH format?

Three things matter most for a limited budget: geography (does the format actually cover the neighbourhood your customers are in, not just a citywide average), cost per view relative to your budget size, and whether the format lets you start and stop on a schedule you control rather than locking into a year-long billboard lease. Vehicle and transit formats tend to score well on all three for a business without national-brand ad money — full billboards and DOOH screens tend to require bigger budgets to make the CPM worthwhile.