Every weekday, tens of millions of Indians spend real time staring at the inside of a metro coach, the back of a bus, or the panel behind an auto driver's head. It's some of the highest-dwell attention in the country, a commuter is trapped with your ad for twenty minutes with nothing better to do. And almost none of it gets measured.
Transit advertising has a specific, solvable attribution problem, and it's different from a static hoarding. Let me break down what's unique about it and how to actually close the loop.
A hoarding is fixed, you know exactly where it is and can estimate the traffic past it. Transit media moves. A bus wrap travels a route through six neighbourhoods. An auto covers a whole city over a week. A metro interior card is seen by a rotating cast of thousands per day. This mobility is the superpower and the measurement headache at once.
The three big transit formats in India:
Here's what makes transit special: it beats a roadside board on the one thing that matters for response, time. A commuter glancing at a flyover hoarding has three seconds. A rider sitting behind an auto seat-back panel has ten minutes and is often already holding their phone.
That's the ideal condition for a scan. Bored, seated, phone in hand, and native cameras read a QR code with no app to download. If your transit ad doesn't give that rider something to do with their idle phone, you're wasting the best response environment in all of out-of-home.
The key is to make each unit of the buy its own tracked entity. What counts as a unit depends on the format:
The principle is the same as any measured offline campaign: a unique link per placement, routing to a fast mobile page, tagged so every scan lands in your dashboard attributed to that line, route or zone. Without unique codes you'll get a total scan count and no idea which slice of the buy earned it, which is exactly the decision you're trying to inform.
A seat-back sticker that just shows your logo and a QR square wastes the moment. The rider needs a payoff:
There's a newer response mechanism worth knowing about: image triggers, where the ad artwork itself becomes scannable, no visible QR square, so the whole creative stays clean. It's genuinely nice for premium metro or brand-led wraps where a QR code would clutter the design.
The honest limitation: image triggers only work inside the Adscano scanner or an app that embeds it, they don't fire from the native camera the way a QR code does. So they're best for engaged audiences who already have the relevant app, and the feature is still in beta. For broad, cold commuter reach, a plain QR code is the safer default because it works from any phone's camera. Use image triggers where you know your audience is app-equipped; use QR where you're reaching strangers.
Once scans land tagged by line, route or zone, the math is the same honest ratio you'd run on any channel:
Cost of the placement, divided into the leads it produced, gives you a cost per lead you can hold up against your metro-line neighbour, your bus route, or your Meta campaign. That comparison is the whole point. Transit has been sold on "estimated daily ridership", a reach guess, for decades. Cost per lead turns it into a performance line item. For the broader framework of connecting an offline impression to an online conversion, see our offline advertising attribution guide.
Transit is the most under-measured, over-attentioned medium in Indian OOH. The commuters are already bored and already holding their phones. Give each unit of your buy a unique tracked code, route it to a page that loads on weak signal, and offer something worth ten idle seconds. Do that and the channel finally tells you which line, route and zone earned its keep.
Turn your next metro or bus campaign into a funnel you can read. Start free and tag every route before it rolls out.