OOH channel comparison: what should you buy?
Billboards vs bus vs rail vs London Underground vs airport vs taxi vs AdVans / mobile billboards - a practical guide to choosing the right OOH channel for your audience, objective, geography and budget.
Jamie Roberts has spent 20 years in advertising for businesses across the UK. He founded Loud! OOH in 2026 to make OOH advertising genuinely accessible to SMEs through transparent, no-markup pricing.
7
OOH channels compared
From £125
per Tube Escalator Panel
From £25
Digital cab screen entry
From £325
Regional 48-sheet billboard
I’ve built this comparison around the OOH formats I actually want a client to consider when we are deciding where a budget should go. The question is not simply which format is cheapest. It is what the format can do for the campaign.
A billboard gives you a fixed location. A bus campaign gives you route repetition. Rail puts you into commuter journeys. The London Underground adds huge frequency and dwell. Airports create a premium attention environment. Taxi advertising can put a message both outside and inside the vehicle. AdVans and mobile billboards are different again because you can take the media to the audience.
The seven channels at a glance:
| Channel | Core role | Typical entry benchmark | Best strength |
|---|---|---|---|
| Billboards | Fixed roadside OOH | From £325 regional 48-sheet | Broad reach and landmark presence |
| Bus + bus stops | Moving + fixed local OOH | From £60 bus rear / £300 shelter | Local saturation and repetition |
| Rail | Station + train OOH | From £75 traincard | Commuter frequency |
| London Underground | Tube station + train OOH | From £10 TCP / £300 4-sheet | London frequency and dwell |
| Airport | Terminal OOH | From £500 regional 6-sheet | Premium audience and long dwell |
| Taxi | Exterior + interior OOH | From £25 digital cab screen | City visibility + captive audience |
| AdVans / mobile billboards | Route-led mobile OOH | From £595 regional / £695 London per day | Take the campaign to a defined audience |
The proper head-to-head comparison:
A channel-by-channel comparison of the main OOH options available to advertisers in the UK. The aim is simple: show what each format does best, where it works, and how it compares on audience, location, reach, frequency, dwell time and cost.
| Measure | Billboards | Bus / stops | Rail | London Underground | Airport | Taxi | AdVans |
|---|---|---|---|---|---|---|---|
| Primary environment | Roadside | Roads + stops | Stations + trains | Stations + Tube trains | Terminals | Roads + vehicle interior | Roads / route |
| Fixed or mobile | Fixed | Both | Fixed | Fixed | Fixed | Mobile fleet | Mobile |
| Audience logic | Site + traffic | Route + postcode | Station + corridor | Station + line + zone | Airport + terminal | City + fleet | Route + audience location |
| Frequency | Site-dependent | High on routes | High for commuters | Very high | Moderate to high | High in city | Route-dependent |
| Dwell | Low roadside | Low outside / higher at stops | High | High | Very high | High inside | Low to moderate while moving |
| Geographic precision | Site | High | High | Very high | Airport catchment | City / zone | Very high |
| Creative flexibility | Static / digital | Static / digital | Static / digital | Static / digital | Static / digital | Static / digital / livery | Static / digital / XL |
| Best use | Mass awareness | Local dominance | Commuter reach | London campaigns | Premium attention | Urban response | Audience-led targeting |
| Main advantage | Scale | Repetition | Frequency | Frequency + dwell | Attention | Two audiences | The route moves with the brief |
The important difference : There is no single OOH format that works best for every campaign. Fixed sites can provide consistent visibility in important locations, while mobile formats offer more flexibility around where and when the campaign runs. The decision should start with the audience, location and campaign objective, then work backwards to the format.
What the current 2026 pricing says:
The figures below are the published planning benchmarks used in the current Loud! OOH channel guides. They are not promises that every site or campaign will trade at exactly these rates. For the complete rate card, see the 2026 pricing page.
| Channel | Format / activity | Published starting point | Planning note |
|---|---|---|---|
| Billboards | Regional 48-sheet | £325 | Static media benchmark; location and availability matter |
| Billboards | Regional 6-sheet | £300 | Street-level alternative to larger roadside sites |
| Bus | Bus rear | £60 | Low-cost moving OOH entry point |
| Bus stops | 6-sheet shelter | £300 | Useful for local targeting and dwell |
| Rail | Traincard | £75 | Lower-entry train format with longer passenger dwell |
| Rail | Station 4/6-sheet | £250 | Station-led commuter visibility |
| London Underground | Tube car panel | £10 | Line-based starting benchmark |
| London Underground | 4-sheet platform poster | £300 | Outer-zone starting benchmark |
| London Underground | Digital 6-sheet | £400 | Outer-zone starting benchmark |
| London Underground | 16-sheet cross-track | £1,000 | Outer-zone starting benchmark |
| London Underground | 48-sheet cross-track | £1,500 | Station-dependent starting benchmark |
| London Underground | Digiwall / digital gateway | £12,000 | Premium digital environment |
| Airport | Regional 6-sheet | £500 | Premium terminal environment |
| Airport | Regional digital 6-sheet | £295 per week | Flexible digital terminal activity |
| Taxi | Digital cab screen | £25 per unit / 4 weeks | Captive passenger format |
| Taxi | Superside | £175–£275 / cab / 4 weeks | Exterior city presence |
| Taxi | Full livery | From £850 / cab | High-impact mobile presence |
| AdVan | Digital mobile billboard | £595 regional / £695 London per day | 8-hour operating day and planned route |
| AdVan | 3-day mobile billboard | £1,595 regional / £1,895 London | Short campaign burst |
| AdVan | 5-day mobile billboard | £2,495 regional / £2,995 London | Sustained presence |
| Electric AdVan | Electric Digital AdVan | From £1,500 / day | Premium electric mobile format |
AdVan source: Loud! OOH AdVan & Mobile Billboard Advertising Costs UK 2026, supplied for this update. The source states that final pricing can vary with vehicle type, geography, availability, operating hours, mileage, route requirements, duration and specialist production.
WHICH OOH CHANNEL SHOULD YOU CHOOSE?
Start with the campaign objective, then choose the channel that best fits the brief. This is where I would make the decision in a real campaign.
| If the brief is... | I would start with... | Why | Then consider... |
|---|---|---|---|
| Reach as many people as possible | Billboards | Broad roadside coverage and landmark visibility | Bus |
| Own a local area | Bus + bus stops | Routes create repetition and shelters add fixed local presence | Billboards / AdVans |
| Reach commuters repeatedly | Rail | Station and train environments create frequency | London Underground |
| Make a London audience notice you | London Underground | High-frequency environment with strong dwell | Taxi / AdVans |
| Reach a very specific business audience | AdVans | Route can be built around offices, agency clusters and business districts | Tube / rail |
| Target an event | AdVans | Route can follow the audience before, during and after the event | Taxi / rail |
| Create premium attention | Airport | Long terminal dwell and concentrated travel audience | London Underground |
| Combine exterior visibility with captive messaging | Taxi | Vehicle is seen in the city and can carry an interior message | Bus |
| Make the media plan move with the audience | AdVans | Geography and timing can be changed around the brief | Taxi |
Different OOH formats solve different planning challenges. A billboard can provide a consistent presence in a fixed location, while mobile OOH can offer greater flexibility around where and when a campaign runs. The right option depends on the audience, geography, campaign objective and the level of flexibility the campaign requires.
Channel profiles:
What each channel actually does in a campaign - and when I would reach for it.
Billboards are still the straightforward choice for broad awareness. The strength is consistency: the site stays where it is and the audience repeatedly passes it. They are particularly useful when a brand needs a recognisable physical landmark in a town, city or region. See the full billboard advertising guide.
Bus advertising is strongest when repetition and geography matter. Rears give moving visibility, supersides increase physical presence, and shelters give you fixed, eye-level exposure with natural waiting time. A strong bus plan can make a brand feel like it owns a neighbourhood. See the full bus advertising guide.
Rail is a frequency channel. The strongest planning is about the stations, corridors and audiences that matter rather than simply buying the largest station available. Traincards add longer dwell inside the carriage, while digital formats introduce scheduling flexibility.
The Underground is different from roadside OOH because passengers are often stationary or travelling long enough to absorb more information. It is particularly strong for London launches, commuter campaigns, brand credibility and repeated exposure. Lower-entry Tube car panels and outer-zone posters make it possible to build targeted campaigns without automatically going straight to flagship takeovers. See the London Underground advertising guide.
Airport advertising trades on dwell and context. The audience is concentrated in a premium environment and can spend significant time around the advertising. It makes most sense when the target audience travels or when the campaign benefits from a more premium setting. See the full airport advertising guide.
Taxi advertising gives you two environments in one campaign: the exterior audience moving through the city and the passenger inside the vehicle. Screens and interiors are particularly useful when a campaign has a response mechanic or more detailed message. See the full taxi advertising guide.
AdVans are the most route-led option in this comparison. The Standard and Electric formats are 20sqm, while the XL is 35sqm. I would use them when there is a clear reason for the vehicle to be somewhere: agency offices, business districts, retail areas, events, transport hubs, competitor locations or a specific postcode. See the full AdVan & mobile billboard guide.
Billboards
Bus and bus stops
Rail
London Underground
Airport
TAXI
AdVans / mobile billboards
The practical difference between fixed and mobile OOH is how the media reaches the audience. Fixed formats build visibility around a chosen location, while mobile formats can be planned around routes, areas and specific timings. Which approach works best depends on the campaign brief.
Budget thinking:
The right answer changes as the budget increases. I would rather create real presence in one or two environments than spread a modest budget across seven channels and make every channel look small.
| Indicative budget | What I would consider | Reason |
|---|---|---|
| Under £1,000 | Billboard, bus rear, rail traincard, Tube entry formats or one-day AdVan | Several channels have genuine low-entry options |
| £1,500–£3,000 | Focused bus, Tube, billboard or mobile OOH activity, depending on the audience and geography. | Enough budget to create concentrated presence |
| £3,000–£10,000 | Two-channel regional plan or sustained AdVan / bus / rail activity | Frequency and depth become more important |
| £10,000–£25,000 | London Underground, coordinated AdVan activity, rail + roadside or bus + taxi | The campaign can build genuine scale in a defined geography |
| £25,000+ | Multi-channel London / regional campaign | Use channels for different jobs rather than simply adding formats |
A useful way to think about the mix: Reach + frequency + relevance. Billboards and bus can provide reach. Rail and the Underground can add frequency. Taxi can add an interior response environment. AdVans can add relevance by physically taking the campaign into the places where the audience is concentrated. Airports can add premium attention.
What I would avoid?
- Choosing the format before defining the audience.
- Comparing only the cheapest unit price.
- Buying the biggest site, station or airport simply because it looks impressive on a media plan.
- Spreading a modest budget so thinly that no channel gets enough repetition.
- Treating an AdVan as a gimmick rather than planning the route as part of the media.
- Assuming one AdVan gives blanket city coverage.
- Using the same creative approach for a Tube panel, roadside billboard and moving vehicle.
- Ignoring production, posting, installation, operating requirements and lead times when calculating the real campaign cost.
The final answer:
If you want broad, fixed visibility, start with billboards. If you want to own a neighbourhood, look at bus and bus stops. If commuters are the audience, rail is a natural fit. If the audience is in London and frequency matters, the Underground becomes very compelling. If the environment and dwell are part of the brand proposition, look at airports. If you want exterior visibility plus a captive passenger audience, taxi is worth serious consideration.
The best OOH format is the one that fits the job. Start with the audience you need to reach, the locations that matter and what you want the campaign to achieve. Then consider the formats that can deliver those requirements within the available budget.
That is the point of this comparison. There is no universal best OOH format. There is a best format for the job the campaign actually needs to do.
Frequently asked questions:
What is the cheapest way to start Out-of-Home (OOH) advertising in the UK?
The most cost-effective entry point for UK OOH advertising is small-format transit media, starting from just £10 to £25 per panel. Formats like Tube car panels in London (from £10/fortnight) and digital taxi cab screens (from £25) deliver high dwell times at micro-budgets. For regional reach, a single static 48-sheet roadside billboard starts at approximately £325 per 2-week campaign, making local billboard advertising accessible without large agency commitments.
Digital AdVan vs Static Billboard: Which OOH format offers better ROI?
AdVans can be a strong option when a campaign needs flexibility around location, timing or specific audiences, whereas static billboards generate superior long-term brand recall through continuous exposure. Static billboards can be better when the priority is maintaining a consistent presence at a particular location over a longer period. The right choice depends on the campaign objective, audience, geography and budget.
How does transit advertising compare to roadside billboards for audience dwell time?
Transit advertising (London Underground, buses, and rail) offers significantly longer dwell times - typically 3 to 15+ minutes - compared to roadside billboards, which average 2 to 3 seconds of viewer glance time. This extended exposure makes transit formats ideal for detailed copy, storytelling, app downloads, and QR code interaction. Roadside billboards, by contrast, demand high-impact visual concepts with 7 words or fewer for rapid motorist processing.
How much does Out-of-Home (OOH) advertising cost in the UK?
UK OOH advertising costs range from micro-entry rates of £10 per panel for transit media up to £1,500+ per fortnight for prime digital billboards. Pricing varies based on traffic volume, digital vs. static display, and location density.
Can you run an effective multi-channel OOH campaign on a limited budget?
Yes, modest marketing budgets under £1,000 can execute effective multi-channel OOH strategies by pairing one regional anchor format with hyper-targeted secondary micro-formats. For example, combining one high-impact 48-sheet billboard with targeted bus streetliners and digital cab screens creates multiple daily touch points across a target city, giving a small campaign the perceived reach of a national brand.
What is the biggest creative mistake brands make with OOH campaigns?
The most common OOH creative mistake is placing text-heavy artwork or small web URLs on high-speed roadside billboards where drivers have only 2 to 3 seconds to absorb the message. Advertisers often treat billboards like print ads. For roadside success, adhere to the "7-word rule," use massive contrast, and reserve long copy exclusively for high-dwell environments like train platforms and bus interiors.
Sources and pricing convention
Sources referenced in this article
- Loud! OOH Insights: Billboard Advertising Costs UK
- Loud! OOH Insights: Bus & Bus Stop Advertising UK
- Loud! OOH Insights: Rail Advertising UK
- Loud! OOH Insights: London Underground Advertising
- Loud! OOH Insights: Airport Advertising Costs UK
- Loud! OOH Insights: Taxi Advertising UK
- Loud! OOH Insights: AdVan & Mobile Billboard Advertising Costs UK 2026
- Loud! OOH: UK OOH Pricing Page
Pricing convention: Media costs only unless specifically stated. Rates can change with location, station tier, availability, seasonality, campaign duration, operating requirements and package structure. Always confirm the live buying rate before publication or booking.
At Loud! OOH we plan and buy OOH campaigns for SMEs and challenger brands across the UK. We publish our pricing openly and do not mark up media costs. See our 2026 rate card or contact hello@loudooh.co.uk / 020 4514 9147.
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