Strategy
Part of What a workable out of home advertising strategy means for UK media planning
How to compare out of home advertising formats
Compare out of home advertising formats by flexibility, production needs and proof, then use four practical tests to choose a fit for your campaign.
What to take away
- The usual mistake is buying formats before defining the job, so the choice never gets tested against a budget or a measure.
- Static, digital and transport differ on cost, flexibility and proof speed, not on quality.
- A single city test with one measure beats a national spread with four.
- Write the decision rule down before you request sites, then compare formats against it.
- Keep a fallback format so a delayed build does not stall the whole plan.
What job is the channel actually doing?
Start with the decision the out of home advertising spend must support. Awareness in one travel corridor is a different job from reminding nearby customers. Each job points to a different format, weight and measurement method.
Write the objective as a sentence you could prove wrong. For example, reaching 30 per cent of shoppers in one city three times during October can be tested. Raising awareness cannot.
Teams that start with the brief avoid buying the cheapest available panel. The strategy and planning guide sets out how objectives, audience and budget fit together before any site list appears.
How do static, digital and transport compare?
Static billboards buy presence. Production is a one-off cost and the artwork is fixed for a committed period. They suit messages that stay true for a month.
Static vs digital vs transport
Static billboard
- Cost pattern
- Lower per panel
- Control
- Low, fixed
- Proof
- Reach models
- Dwell
- Seconds
- Best message
- Fixed monthly
Digital screen
- Cost pattern
- Higher per impression
- Control
- High, mid-flight
- Proof
- Play-out logs
- Dwell
- Seconds
- Best message
- Rotating offers
Transport
- Cost pattern
- Route-dependent
- Control
- Medium
- Proof
- Route data
- Dwell
- Minutes
- Best message
- Longer copy
Digital screens buy flexibility. Creative can rotate by daypart or day of week, and a campaign can be amended mid-flight. That control carries a higher rate per impression and more production demands.
Transport formats buy dwell. Rail and bus environments hold attention for minutes rather than seconds, but audiences skew to commuters and coverage is tied to routes.
Context narrows the list further. Roadside panels suit short, simple messages seen at speed. Retail and station settings allow longer copy and closer targeting by time of day.
Cost pattern
- Static billboard
- Lower per panel, fixed production
- Digital screen
- Higher per impression, rotating slots
- Transport
- Route-dependent, longer dwell
Control
- Static billboard
- Low, artwork fixed
- Digital screen
- High, amend mid-flight
- Transport
- Medium
Proof
- Static billboard
- Reach and frequency models
- Digital screen
- Play-out logs plus modelled reach
- Transport
- Route data plus survey work
Creative also constrains the choice. Video built for a small player often fails on a large screen, which is why the IAB UK principles for digital video creative are worth checking before you commit to video-capable inventory.
What does a worked comparison look like?
Suppose a retailer sets an illustrative £40,000 to reach shoppers in one city for four weeks.
Option one is 20 static panels at an illustrative £1,500 each, which is £30,000, plus £4,000 production, leaving £6,000 for a small research study.
Option two is eight digital screens at an illustrative £3,500 each, which is £28,000, plus £8,000 production for three rotating versions. Nothing is left for research, but play-out logs give a delivery record.
Option three is a transport package at an illustrative £36,000 with production included. Coverage is narrower but dwell is longer.
Keep production in the same budget line as media. A plan that funds panels but not artwork never runs.
None of these is right in the abstract. Option one wins if the message is fixed and proof matters. Option two wins if the offer changes weekly. The planning template helps you score each option against the same criteria.
What rules affect digital and data-led formats?
Digital signage that counts passers-by or reads a device can fall inside storage and access rules. The ICO guidance on storage and access technologies explains when consent or an exemption applies.
Ask whether pixels, sensors or cameras are involved before you sign anything. The answer decides which rules apply and how the site needs to be configured.
Content rules apply across formats. The ASA's AdviceOnline library covers claims, targeting and sector-specific restrictions that affect what you can put on a panel.
Which option should you choose?
Score each format against four tests: does it reach the defined audience, can it carry the message, does the budget cover production, and can you measure the agreed outcome.
If two formats tie, choose the simpler proof route. A clear delivery record beats a reach gain you cannot evidence.
Common questions
Can I mix formats in one campaign?
Yes. Use one format for broad presence and another for a corridor, provided each has its own measure and budget line.
How long before I see results?
Out of home rarely produces same-day response. Allow at least the campaign period plus a week before judging anything against the plan.
What kills a channel strategy fastest?
Changing the objective mid-flight. If the goal shifts from awareness to response, the format, creative and measure all need revisiting.
Is digital always the better buy?
No. Digital buys control and speed. Static buys coverage per pound when the message does not change, and transport buys dwell. Match the format to the job.
