How Route audience data works for OOH buys outside London

What to take away

• Out of home advertising outside London is planned and sold on Route audience data, the UK industry's official measurement currency for the medium.
• Route measures people passing poster sites and how long they could see them, reported as impacts and cover rather than as raw footfall counts.
• Regional buys in the North West, West Midlands and Yorkshire need the same discipline as London buys, but with more attention to panel sample size and site-level reliability.
• Route figures describe opportunity to see, not sales, so pair them with sales, footfall or brand tracking before you commit budget.
• Ask for sample sizes, confidence intervals and the release version behind any regional figure quoted to you.
• Treat Route as one input in a measurement plan, not the whole case for a regional campaign.

What Route measures and who runs it

Route is the UK's audience measurement system for out of home advertising. It estimates how many people pass each poster site, how often, and for how long the site was in view. The output is a common currency: planners, agencies and media owners all quote the same numbers when they trade.

It is run by the industry, not by a single media owner. Route Ltd is funded by the major outdoor media owners and governed with advertiser and agency representation, which is why its figures carry weight in negotiations. Outsmart, the OOH industry body, promotes the medium and its standards.

What Route does not do matters just as much. It does not measure sales, brand recall or attention. It estimates the opportunity to see an advertisement. A high impact figure means many people had the chance to look, not that they did look or responded.

That distinction shapes every regional buy. In the North West, West Midlands or Yorkshire, you are buying a modelled audience, not a headcount at a bus shelter. The model is good, but it is a model.

Route also underpins how sites are packaged. Media owners build packs and networks around Route impacts, so the currency determines what you can buy as much as how you judge it.

If you want a fuller picture of how currency and reporting fit together, our guide to measurement and reporting sets out where each piece belongs in a plan.

Data protection sits underneath all of this. Any audience measurement that touches personal data, including camera-based systems, has to comply with UK GDPR rules, which the ICO sets out in its UK GDPR guidance and resources.

How Route panels and audience data are built

Route combines two things: a travel survey and a model of the road and transport network. The survey captures how people move around, by mode, at different times. The model assigns those movements to routes and past sites.

Here is the sequence in plain terms.

1. A sample of the population records its travel behaviour over a period, including journeys, modes and times.
2. Those journeys are expanded to represent the wider population, using demographic weights.
3. The road, rail and pedestrian network is modelled, with each poster site given a location and visibility characteristics.
4. The expanded journeys are run past the sites to produce counts of passes and viewing opportunities.
5. The results are published as impacts, reach, frequency and cover for defined audiences and time periods.

Visibility is central. Route applies a visibility adjustment to each site, reflecting how much of the advertisement a passer-by could realistically see. A site on a fast dual carriageway scores differently from one on a busy high street pavement.

The panel sample is the weak point outside London. National samples are large, but once you filter to a specific audience in a specific region, the base shrinks. A figure for 18 to 34 year olds in a single Yorkshire town may rest on a small number of respondents.

Route publishes confidence intervals alongside estimates for this reason. Read them. A wide interval means the true figure could be materially different from the quoted one, which changes how much weight the number can carry in a media plan.

Media owners and agencies also use Route data in buying systems, which is why the same site can appear with slightly different figures across tools if release versions differ. Always check which release a number comes from.

Applying Route data to buys in the North West, West Midlands and Yorkshire

Regional buying is not London buying with a different map. The inventory, the travel patterns and the competitive set all differ. Route data lets you compare sites on a like-for-like basis if you use it carefully.

Start with the audience definition. A broad adult definition will give you large, stable numbers. A narrow one, such as ABC1 adults who commute by tram, will give you small numbers with wide intervals. Match the definition to the decision you are making.

Then set the geography. Route works at postcode and travel-zone level, so you can build a trading area around a store catchment, a city centre or a motorway corridor. In the North West, that might mean Manchester city centre plus the M60 ring.

In the West Midlands, Birmingham and the Black Country. In Yorkshire, Leeds, Bradford and the M62 corridor.

Worked example. A retailer wants to reach adults in the West Midlands across a four-week campaign. The plan uses 60 sheets and digital screens across Birmingham, Solihull and Wolverhampton.

• Define the audience: all adults, then a secondary cut of adults 25 to 54.
• Pull Route impacts and cover for each site over four weeks.
• Check the confidence interval on each site's estimate.
• Build the pack to hit a target cover level, not just a total impacts figure.
• Compare the pack's frequency distribution against the campaign objective.
• Review the site list against the client's catchment priorities.

The result is a pack with a stated cover and average frequency, plus a note on how reliable each figure is. That note is what separates a defensible plan from a hopeful one.

Regional media owners often hold their own Route-based analyses for their estates. Ask for them, but check the audience definition and the release version before you accept the numbers.

In Yorkshire, the spread of towns means cover builds differently from a single conurbation. You may need more sites to reach the same proportion of adults, which affects cost per thousand. Route lets you see that trade-off before you buy.

For a wider view of how research methods map onto buying decisions, our audience research guide covers the options in England.

Where Route data is thin outside London

London has the densest transport network, the largest panel and the most inventory. That combination produces the most stable Route estimates in the UK. Outside London, stability varies.

In the North West, Manchester and Liverpool have enough density for fairly steady figures. Smaller towns and rural corridors do not. A site on the A59 between settlements may have a large modelled audience but a thin survey base behind it.

The West Midlands is mixed. Birmingham behaves like a major city in measurement terms. Areas such as the Black Country and the shire counties have fewer sites and fewer panel respondents, so estimates move more between releases.

Yorkshire is the most varied of the three. Leeds and Sheffield carry decent sample. Coastal towns, the Dales and the M62's rural stretches do not. Planning a county-wide buy on site-level figures alone invites error.

There are three practical responses.

First, aggregate. Group sites into packs and read the pack-level figure, which rests on a larger base than any single site. Second, widen the audience. A broader definition produces a steadier estimate, even if it is less precise for your target.

Third, use ranges. Present a low and high case rather than a single number, and plan against the low case.

Roadside digital and large format sites often carry better data than small-format or niche locations, simply because they are modelled with more traffic. That is a measurement artefact, not a statement about creative quality.

When a figure looks too precise for its base, it probably is. Our list of common measurement mistakes covers the errors that recur most often in regional planning.

Combining Route with other measurement evidence

Route tells you about exposure opportunity. It cannot tell you whether the campaign worked. For that you need other evidence, and the strongest plans combine several sources.

Sales and footfall data are the most direct. If a regional campaign runs alongside store-level sales or footfall counters, you can compare exposed and unexposed areas, or pre and post periods. Route defines the exposure; sales data tests the effect.

Brand tracking adds recall and consideration measures. It is slower and more expensive, but it answers questions Route cannot, such as whether the advertising registered with the audience.

Mobile and location data can corroborate movement patterns, though it brings its own compliance obligations. The ICO's guidance on CCTV and video surveillance is relevant where camera-based measurement is used, and any personal data processing needs a lawful basis.

Cross-media measurement is the direction of travel. Origin, the UK initiative to measure audiences across media, aims to give advertisers a common view of reach across channels, and ISBA explains the initiative in its Origin cross-media measurement pages. If it delivers, OOH's contribution to a mixed campaign becomes easier to isolate.

Industry bodies also publish practical guidance on buying and measurement practice. ISBA's media knowledge section is a useful reference for how measurement sits within media buying more broadly.

Whatever mix you use, agree the success measure before the campaign starts. Route figures chosen after the fact to flatter a result are not evidence. Our explanation of key metrics helps you pick the right one in advance.

Common mistakes when reading Route figures

The errors below appear repeatedly in regional plans. Each one is avoidable with a little discipline.

Treating impacts as people? Impacts are opportunities to see, and one person can generate many. A campaign with ten million impacts has not reached ten million people.

Ignoring the confidence interval? A point estimate without its interval overstates precision. In thinner regional markets the interval can be wide enough to change the plan.

Comparing figures from different releases? Route updates its data periodically. Mixing releases in one comparison produces differences that are artefacts, not insights.

Using a narrow audience in a small area? The base shrinks fast. If the sample is small, widen the audience or aggregate sites, and say so in the plan.

Assuming London benchmarks travel? Cost per thousand, cover and frequency patterns differ by region. A London benchmark applied to Yorkshire will mislead.

Forgetting the creative and context? Route models visibility, not attention or persuasion. A well-placed site with weak creative still underperforms.

Skipping the compliance check? Any measurement involving personal data needs a lawful basis and transparency. Check the rules before you brief a data-led element.

Read the figures as estimates with uncertainty, use them consistently, and pair them with evidence about what happened next. That is how Route earns its place in a regional buy.

Common questions

What is Route in out of home advertising? Route is the UK industry's audience measurement system for OOH. It estimates how many people pass each poster site, how often and with how much visibility, and reports the results as impacts, reach, frequency and cover.

Can I use Route data for a buy in the North West, West Midlands or Yorkshire? Yes. Route covers the whole UK. The caution is precision: outside London the panel base behind narrow audiences and individual sites is smaller, so check confidence intervals and consider aggregating sites into packs.

Why do Route figures differ between tools? Different tools may hold different data releases, or apply different audience definitions and geographies. Always establish which release and definition produced a figure before you compare it with another.

Does Route measure whether my campaign worked? No. Route measures the opportunity to see advertising. To judge effectiveness you need sales, footfall, brand tracking or another outcome measure, agreed before the campaign starts.

How many sites do I need for cover in Yorkshire? It depends on the audience, the geography and the site types. Yorkshire's spread of towns usually means more sites than a single conurbation for the same cover, so model the pack in Route rather than assuming a London ratio.

What rules apply to camera-based audience measurement? Any processing of personal data must comply with UK GDPR, with a lawful basis and transparency about what is collected. The ICO publishes guidance on both general data protection and video surveillance.