Out-of-home 101: billboards, transit, street furniture and digital screens

Out-of-home (OOH) is advertising people meet outside their homes: roadside billboards, posters in stations and on buses, bus shelters and kiosks (street furniture), and screens in malls, airports and city centres. When the frame is a screen, it is digital out-of-home (DOOH). As of October 2026, the World Out of Home Organization (WOO) puts global OOH spend in 2025 at about $54.2 billion, up 15% on 2024 and about 5.1% of all advertising³.

In one line: out-of-home is the broadcast medium of the street. It cannot be skipped, blocked or scrolled past, and it works best with few words and a strong image.

A media owner (an outdoor company, a transit authority's concessionaire, a mall or an airport) owns or leases the sites and sells space on them. A classic poster is printed and pasted or hung for a booked period. A digital screen shows a loop: several advertisers share it, each getting a slot of seconds in every cycle, so the same frame can carry different messages by hour or by day.

Who does what

• The advertiser sets the objective, the cities or routes and the budget.
• The media agency or an OOH specialist chooses sites and screens against the audience, books them and checks delivery.
• The media owner sells the sites, prints or schedules the content and reports what ran: photographs of posted sites, or play logs for screens.
• The measurement body (Route in the UK, Geopath in the US) publishes the audience estimates that both sides trade on⁶⁷.
• Programmatic platforms, where screens are sold that way, carry the bids between buyers and media owners¹¹.

Because nobody logs in to a billboard, OOH audiences are estimated. Industry currencies combine three kinds of data:

In the UK, Route combines a travel survey, independent counts and a visibility adjustment, which gives a likelihood to see rather than a bare opportunity to see⁶. In the US, Geopath builds impressions from traffic volumes, demographic data and mobile movement data⁷, and its likelihood-to-see model rests on eye-tracking research that weighs a frame's size, its position in the field of view and the time spent passing it⁸. The outputs are the familiar planning terms: reach, frequency and impressions, from which a CPM can be worked out.

Programmatic DOOH sells screen time through the same machinery as online display: a supply-side platform (SSP) offers a screen's slots and a demand-side platform (DSP) bids for them. IAB Tech Lab's OpenRTB guidelines for DOOH set a common way to describe a screen in a bid request¹¹, including the fact that one play on a public screen can be seen by many people at once¹⁰.

Posters are the oldest of the paid media, and the industry organised early. In 1872 the International Bill Posters' Association of North America was formed in St. Louis, and in 1891 delegates in Chicago created the first national body, the Associated Bill Posters' Association of the US and Canada¹². One of its first acts was to refuse collectively to post material considered offensive, which the Duke University archive that holds the OAAA's records describes as the start of the industry's self-regulation; a 1925 merger created the Outdoor Advertising Association of America¹³.

Regulation followed the roads. The US Highway Beautification Act of 1965 replaced the voluntary 1958 "Bonus Act" and required states to control outdoor advertising within 660 feet of the highway or lose ten percent of their federal-aid highway funds¹⁵.

OOH is used in every region, and Asia-Pacific is by far the largest. WOO puts 2025 spend at about $29.7 billion in Asia-Pacific, around 55% of the world total, followed by North America at $10.3 billion, Europe at $10.2 billion, Latin America at $2.9 billion and Africa at $1.2 billion³. Screens now take 47% of global OOH spend, about $25.5 billion⁴.

• Americas. US OOH revenue reached a record of about $9.46 billion in 2025, up 3.6%, with digital at 36.3% of the total and transit the fastest-growing format, up 9.2%, according to the OAAA¹.
• Europe. UK OOH revenue reached £1.44 billion in 2025, up 2.6%, the highest on record, with digital at 67% of revenue, according to Outsmart's figures compiled by PwC².
• Middle East and Africa. OOH falls under general media and advertising law; in the UAE, the federal media law can require a media licence before advertising activities¹⁹.
• Asia-Pacific. By far the largest region, with around 55% of global OOH spend, by WOO's count³.

The audiences are defined by movement rather than by programme: commuters on a rail line, drivers on an arterial road, shoppers in a mall, travellers in an airport. That makes OOH planning a geography exercise. The planner starts from where the target audience lives, works and shops, then picks the frames along those routes, and uses the currency's estimates to check reach and frequency⁶⁷.

Out-of-home is a reach medium. It suits brand awareness, a product launch that needs to look big, event promotion close to the venue and market entry in a city. Proximity makes it useful near the point of sale: shelters and mall screens close to stores for retail and consumer goods, airports for travel and hospitality, roadside for automotive, and city-centre screens for film, music and streaming launches in media and entertainment.

In an integrated plan, OOH often carries the campaign's key visual where people travel, while other disciplines carry the detail. Digital screens add timing: a message can change by hour, weather or event, and programmatic buying lets those changes follow rules set in advance¹⁰¹¹. The discipline's hub is out-of-home.

OOH is priced in four main ways:

• By site and period. A classic billboard or poster site is booked for a set period at a price that reflects its estimated audience and location.
• By network or package. Transit and street-furniture owners often sell a network of panels across a city or a route.
• By share of time. On a digital screen, an advertiser buys a slot in the loop, a share of the time the screen is on.
• By impression. In programmatic DOOH, buyers bid per thousand estimated impressions (CPM), using the audience estimate attached to each play¹⁰¹¹.

Media owners rarely publish rate cards, so this primer gives no list prices. What the sources do give is the size of the market:

Programmatic DOOH is still a small part of the total: a WOO study compiled by PwC from supply-side platform data put it at about $1.3 billion in 2025, or 7.0% of global DOOH spend⁵. Production, printing and installation for classic sites, and creative versions for digital, come on top of media costs.

This section describes the main frameworks; it is not legal advice.

• United States. The Highway Beautification Act, codified at 23 U.S.C. 131 with rules at 23 CFR Part 750, requires states to provide effective control of outdoor advertising next to the Interstate System, the federal-aid primary system and the National Highway System; state-federal agreements set size, lighting and spacing criteria¹⁴. Cities and counties add their own zoning.
• France. Decree No. 2022-1294 of 5 October 2022 extended the night-time switch-off of lit advertising, between 1 am and 6 am, to all such adverts in public space whatever the size of the town, with exceptions such as airports and transport street furniture during service hours (for digital adverts, only if the image is static); breaches can be fined up to €1,500¹⁷. The Conseil d'État largely upheld the decree in February 2023, finding that fighting energy waste is in the general interest¹⁶.
• United Kingdom. Non-broadcast advertising, including posters and digital screens, follows the CAP Code enforced by the ASA; it does not normally need clearance in advance, though CAP offers copy advice¹⁸.
• United Arab Emirates. Under Federal Decree-Law No. 55 of 2023, a media licence may be required before advertising activities¹⁹.

Content codes for sensitive categories (alcohol, gambling, food high in fat, salt or sugar) often apply with extra force to OOH, because children see posters too; check the local code.

• Few words. People see a roadside frame for seconds. Long copy, small type and web addresses fail.
• Estimates, not counts. Audiences come from models⁶⁷. Figures from Route, Geopath and other currencies are not directly comparable, and a frame's estimate is not proof that anyone looked.
• Standards are still being built. The MRC's finalised OOH standard covers impressions in its first phase; a standard for persons-based audience measurement is left to a second phase⁹.
• Planning rules come first. A site that breaches highway or local rules can be refused or removed¹⁴¹⁷.
• Programmatic is young. At 7.0% of DOOH spend⁵, programmatic inventory is still a slice of what is available; many premium sites are still sold directly.
• Unchecked delivery. Ask for proof that the campaign ran: photographs of posted sites, or play logs for screens.
• Night-time and energy rules. In France, lit and digital adverts must go dark between 1 am and 6 am¹⁷.

• Screens pass paper. WOO forecasts global OOH spend of $56.4 billion in 2026, with digital at 49% of it, about $28 billion³⁴.
• Programmatic grows from a small base. WOO and PwC put programmatic DOOH at 7.0% of DOOH spend in 2025 and plan to keep tracking it⁵.
• Persons-based standards. The MRC has left persons-based OOH audience measurement to a second phase of its standard⁹.
• Common buying rules. IAB Tech Lab's updated OpenRTB guidance for DOOH aims to cut custom integrations between screens and buying platforms¹¹.

Choose it when you need local or national fame, a simple message and repetition on the routes your audience travels. Pair it with advertising for scale and with digital advertising for follow-up, and use which mix for which objective to weigh it against the other disciplines.