OOH measurement is evolving. But is the industry ready for one currency?

India’s OOH industry has come a long way in terms of measurement. From traffic and footfall to audience movement, visibility, reach and frequency, the medium today has far more data at its disposal than it did even a few years ago.

But a measurement system is not necessarily a measurement currency. The bigger challenge for OOH now is getting advertisers, agencies and media owners to agree on a framework they trust enough to use not just for evaluating campaigns, but for planning, buying and pricing inventory.

That question has become particularly relevant with RoadStar being positioned as a common OOH currency. While the industry broadly agrees on the need for standardisation, questions around adoption, methodology, validation and commercial use remain.

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“From my experience in the OOH industry, I believe India has come a long way in measurement. However, we are still at a stage where measurement is more useful for demonstrating the value of a campaign after it is executed than for actually deciding what inventory to buy, at what price,” said Vishnujith PK, Director & Marketing Head, Malabar Advertising.

The case for a common OOH language

As media planning becomes increasingly integrated, OOH is expected to sit alongside TV, digital and CTV. But industry voices argue that this does not mean forcing every medium into an identical measurement framework.

“As media planning becomes increasingly integrated, I don't believe the objective should be to make every medium directly comparable. Each medium has a distinct role and, more importantly, each complements the other in building communication,” said Fahim Batliwala, Chairman, Managing Director and Promoter, SIMCA Advertising Limited.

For OOH, the priority is therefore a common language around core metrics, rather than identical measurement.

“For OOH to sit confidently alongside TV, digital and CTV in a media plan, we need a common language around reach, frequency, impressions and incremental reach. I don't think OOH needs to replicate every metric used by other media, but the numbers need to be comparable enough for a planner to make a meaningful media mix decision,” said Vishnujith.

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Rajesh Radhakrishnan, Co-Founder & CMO, Vritti iMedia & Mindwave Media, similarly sees value in common metrics, while retaining OOH-specific parameters.

“What we need is a common measurement layer that allows advertisers to compare media without ignoring these fundamental differences. Reach, frequency, impressions, CPMs and incremental reach can form part of that common language, while OOH-specific factors such as location, traffic, dwell time and visibility also need to be recognised.”

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For Nipun Arora, Co-founder, OSMO, the bigger technical challenge lies in cross-media deduplication.

“There is also a fundamental challenge with measuring OOH reach in isolation within a larger media mix. If a campaign is running simultaneously across TV, digital and OOH, accurately determining the unique incremental reach delivered by OOH requires robust cross-media deduplication. Simply adding the reported audiences of each medium does not tell us how many unique people the campaign actually reached.”

His view is that standardisation should not come at the cost of recognising differences between media.

“Therefore, I think the realistic objective should be standardised definitions, transparent methodologies and a credible framework for deduplication, rather than expecting identical measurement across every medium.”

The gap between measuring and buying

The industry's bigger concern is that measurement is still not consistently influencing the decisions that happen before a campaign is bought.

“A true currency has to influence the entire planning and buying process: which audiences to reach, where those audiences are most likely to be found, what inventory can deliver that audience opportunity, how frequently they are likely to be exposed, and whether the price being paid reflects the value delivered,” said Batliwala.

The problem, he added, is partly the lack of consistency across datasets and definitions.

“The reason measurement is still more commonly used for evaluation than buying is partly because the industry is working with multiple definitions, datasets and assumptions. Until those inputs are sufficiently consistent and comparable, it becomes difficult to use them as a common basis for planning and trading.”

Radhakrishnan points to the legacy of OOH buying as another reason.

“Historically, OOH buying has been influenced heavily by location knowledge, traffic, visibility, market experience and negotiated rates. This explains why measurement is still more commonly used to validate a campaign after it has been planned than to determine which individual site should be purchased and at what price.”

At the site level, however, measurement is already becoming more sophisticated.

“We already use data and measurement to evaluate the effectiveness of individual OOH sites. For example, through our in-house platform LOC8, we can assess multiple parameters including visibility duration, average speed, traffic, mid and peripheral vision, placement and other site-level characteristics,” said Arora.

The challenge is turning that intelligence into a planning input.

“The next step is making this type of intelligence more consistently usable at the planning and buying stage, rather than treating measurement primarily as a post-campaign evaluation tool,” he added.

Can RoadStar become the industry’s currency?

This is where RoadStar enters the conversation. The platform is being positioned as a common OOH currency at a time when the industry is looking to reduce fragmentation in measurement. But a common currency ultimately depends on whether the market agrees to use it.

“Roadstar is an important step in that direction because the industry genuinely needs a common currency. But for any currency to become widely accepted, it needs broad participation across agencies and media owners, transparency around its methodology, and strong independent validation,” said Vishnujith.

Batliwala believes the bigger issue is not whether one platform wins, but whether the ecosystem trusts the framework.

“A currency becomes a currency when the market collectively agrees to use it as a reference point for planning and trading.”

He added: “How transparent is the methodology? How independently is it validated? Can stakeholders understand and challenge the assumptions? Is there sufficient representation across the industry? And, ultimately, are agencies and advertisers willing to use it to make actual buying decisions?”

For Radhakrishnan, the complexity of OOH inventory makes that standardisation harder.

“One of the challenges is the structure of the OOH business itself. Outdoor inventory is extremely heterogeneous. A site in a high-footfall commercial market cannot be valued in the same way as one on a highway or in a lower-density location.”

That makes governance and credibility as important as the technology itself.

“The objective should be to reduce fragmentation, not simply replace one set of measurement silos with another. From SIMCA's standpoint, credibility and industry confidence have to come before universal adoption can follow,” said Batliwala.

Reach is the starting point, not the finish line

The currency debate is happening alongside another shift in how advertisers assess media. Reach and impressions remain fundamental to OOH, but attention and outcomes are increasingly entering the measurement conversation.

“I don't believe impressions and reach alone will be enough in the long term. Advertisers increasingly want to understand what their media investment actually delivered. OOH has a natural advantage here because it exists in the physical world. Store visits, footfall, brand lift, search behaviour and ultimately sales can make the medium much more accountable,” said Vishnujith.

But that does not mean every OOH campaign should be judged on immediate conversions.

“The way advertisers evaluate media is changing, but I don't believe OOH needs to become an ROI medium to justify its place in the media mix. Reach and impressions remain essential because they establish the scale of an opportunity and whether the medium is reaching audiences in the right locations and at the required frequency,” said Batliwala.

Arora argues that attention adds another layer to the equation.

“Impressions and reach remain fundamental because they establish the scale and potential delivery of an OOH campaign. But exposure alone does not tell us whether the communication had a meaningful opportunity to be noticed.”

Creativity remains equally important. Radhakrishnan points out that measurement cannot compensate for a message that fails to cut through.

“You may know how many people passed a particular site, but if the creative does not make someone look, remember or respond, the number by itself has limited value.”

That leaves OOH at an interesting inflection point. The medium is no longer simply arguing that it deserves to be measured. It is trying to determine what that measurement should mean commercially.

Arora summed up the direction: “I don’t see this as an ‘impressions versus outcomes’ debate. A more complete measurement framework is: Reach establishes scale → attention establishes the quality of exposure → outcomes establish impact.

The next battle for OOH, then, may not be about collecting more data. It is about building enough consensus around that data for it to become a currency the market can actually use.

“My biggest observation from the market is that OOH is no longer just a visibility medium. With the growth of digital OOH, better data and more sophisticated planning, it is becoming a much more measurable and accountable part of the media mix. The next big step is to standardise that measurement and build enough industry confidence around it,” said Vishnujith.

And the test of that confidence may ultimately be simple: whether measurement changes what advertisers buy, what agencies recommend and what media owners can credibly charge for.

“Once advertisers and agencies can confidently answer three questions: Who did I reach? How often did I reach them? And what did that exposure achieve? OOH will be in a much stronger position to compete for a larger share of media budgets,” Vishnujith concluded.