DOOH advertising regulations, what actually governs a billboard.

How digital billboard advertising is regulated

There is no single "DOOH law." A digital billboard sits under several rulebooks at once, each covering a different question. Placement law decides whether a sign can physically stand where an operator wants it. Industry and state rules decide how a digital message can behave once the sign is up: how bright, how much motion, how long each message must hold. Content codes, where a dedicated advertising regulator exists, decide what a message is allowed to say or show. Privacy law, separately, governs how a screen can count or profile the people who pass it.

This guide walks through each layer by jurisdiction: US federal placement law, US state and industry rules for digital message behavior, the UK's content regulator, and the EU's privacy angle on audience measurement. None of it is legal advice. Rules change, vary by state, city and even individual road, and the right move before booking or designing a creative is to confirm current local requirements, ideally with your screen operator or local counsel.

United States: federal highway law

The controlling US federal law is the Highway Beautification Act of 1965 (Public Law 89-285), signed by President Lyndon B. Johnson on October 22, 1965, and informally known as Lady Bird's Law for the First Lady who championed it. It governs outdoor advertising along interstate highways, federal-aid primary roads and the National Highway System, a network of about 306,000 miles.

Its core mechanic is a setback: the Act generally bars new billboards within 660 feet of the edge of these highways, with narrow exceptions such as official directional signs and signs advertising an on-site business. For billboards that remain legally permitted near covered roads, the Act requires states to set standards for size, lighting and spacing. Its stated purpose, in the text of the law itself, is protecting scenic beauty, highway safety and the economic value of highway frontage.

The Act does not enforce itself at street level. It is generally administered through state departments of transportation, which issue the permits and set the size, lighting and spacing standards the law requires, working with the Federal Highway Administration (FHWA), the federal agency responsible for the highway system the Act protects. That two-layer structure, a federal statute plus state administration, is why the practical answer to "can I put a sign here" almost always runs through a state DOT, not Washington directly.

United States: state rules and industry guidance

The Highway Beautification Act decides where a sign can stand. It says very little about how a digital face on that sign should behave, and that gap is filled by state law and by the out-of-home industry's own self-regulation. The main industry body is the OAAA (Out of Home Advertising Association of America), which publishes a Code of Industry Principles and maintains a compendium of state changeable-message and digital-billboard laws.

On a standard-size digital billboard, OAAA guidance calls for static messages, meaning non-animated, non-flashing and non-full-motion content, outside dedicated entertainment districts such as a Times Square-style zone where different local rules apply. The other lever is time: a minimum message display duration, so a digital face cannot cycle too fast to be read or to distract a driver. That minimum is set state by state and varies; it commonly runs around 4 seconds in many states, and some states require longer. Georgia is a documented example, with a minimum display duration of about 10 seconds.

These are guidance and state statute, not a single nationwide digital-signage rule, so the exact minimum display time, motion allowance and entertainment-district carve-outs a given screen must follow depend on its state and municipality. Anyone designing a creative for a specific screen should confirm the local minimum before locking the edit.

United Kingdom: the ASA and the CAP Code

The UK's system looks different again, because it centers on content rather than physical placement. The Advertising Standards Authority (ASA) is the UK's independent advertising regulator. It applies the CAP Code, formally the UK Code of Non-broadcast Advertising and Direct & Promotional Marketing, which is written by the Committees of Advertising Practice (CAP), the industry body that sets the standards the ASA enforces.

The CAP Code covers posters on billboards, poster sites and at stations, alongside other non-broadcast media. Its content rules include restrictions on alcohol advertising in media where more than 25% of the audience is under 18, a threshold that rules out plenty of poster locations for alcohol creative outright. It also draws a line between imagery that is appropriate for a public street setting and imagery that would be fine in, say, a magazine a reader chose to pick up: a poster cannot be avoided by anyone walking past it, so the Code holds outdoor creative to a more conservative bar than opt-in media.

For a UK campaign, the practical takeaway is to check a creative against the CAP Code's outdoor-specific guidance before booking, particularly for alcohol, gambling and anything aimed at, or likely to be seen by, under-18 audiences.

European Union: privacy rules for audience measurement

The EU does not have a single pan-European sign-placement law comparable to the US Highway Beautification Act; that stays at the member-state and municipal level. The live regulatory question for digital out-of-home in the EU is instead privacy, specifically how a screen is allowed to measure who is looking at it.

Digital signage increasingly uses camera-based audience measurement: counting how many people pass or pause near a screen. Anonymous, aggregate techniques, meaning the system never stores images or identifies an individual, processes what it sees on-device, and only detects presence rather than recognizing identity, are generally compatible with the General Data Protection Regulation (GDPR) because no personal data is retained. Standard good practice is still to post a clear notice that measurement technology is in use near the screen, even when no personal data leaves the device.

That settled reading may shift. The European Commission's Digital Omnibus proposal, introduced in November 2025, is a live legislative development, not settled law. As proposed, it would fold cookie-style consent rules into the GDPR framework and add an EU-wide exemption path for first-party aggregated audience measurement. Anyone running or planning EU digital-signage measurement should track the Digital Omnibus as a proposal in progress rather than treat it as current law.

How Blindspot approaches local placement rules

Everything above describes government and industry rules, not anything Blindspot itself sets. Blindspot's part in the compliance picture is narrower: the platform lists screens through vetted operators who already hold the placement approvals and permits for that specific location, and a booked campaign passes an operator review before it goes live, the same operator-approval step used across the platform for every booking. That review is one practical checkpoint, not a substitute for the jurisdiction-specific rules described above, and advertisers running sensitive categories, such as alcohol or anything aimed at a UK audience under the CAP Code, or a US screen with a specific state message-duration rule, should still confirm the applicable requirement themselves.

This is also, separately from the regulatory picture, where Blindspot's own platform facts belong: more than 3,000,000 screens across 50-plus countries, priced by average cost per play rather than by impression, from about $0.23 a play on the platform's lower end, with self-serve booking available from as little as $40. Those are Blindspot platform numbers about how the product is bought, kept here deliberately apart from the laws and codes named above, which apply regardless of which platform or operator a campaign runs through.