How to measure taxi advertising
Yes, you can measure it — and you should demand to. Modern taxi and rideshare advertising is measured six ways: Geopath-modeled impressions, GPS play logs on digital tops, mobile-location attribution to store and site visits, exposure-based retargeting, brand-lift studies, and a unique promo code or QR on the creative. But the metric that matters is cost-per-memory — CPM adjusted for how many impressions actually become recall — because an impression is not a memory.
The one idea to hold on to
A campaign that reaches 250,000 people can leave roughly 5,000 real memories. Most impressions are never remembered, so two buys with the same CPM can differ 10× in cost-per-memory depending on creative and format. Measure toward memory and outcomes — not raw "views."
The six ways to measure — and what to demand
Modeled impressions (Geopath)
The US industry standard: modeled "opportunities to see" based on traffic, routes and audience data. Every serious OOH quote should cite Geopath-measured impressions, not a made-up "views" number.
Strength: Standardised, comparable across vendors and media.
Limit: An impression is an opportunity to see — not proof anyone looked or remembered.
Demand: Ask for Geopath-measured impressions and the audience definition behind them.
GPS / play logs (digital cartops)
Digital taxi tops log where and when each ad actually played, by GPS. You get a map and time-stamped proof of delivery in your target zips and dayparts.
Strength: Proof of delivery: real locations, real times, real play counts.
Limit: Still delivery, not attention — pair it with an outcome metric.
Demand: Ask for a post-campaign GPS/play-log report by zip and daypart.
Mobile-location attribution
Matches anonymised phones exposed to the ad against later store visits, site visits or conversions — the closest OOH gets to a "did it work" number.
Strength: Ties exposure to a real business outcome (visits, lift).
Limit: Needs scale and a measurement partner; privacy-safe and modeled, not 1:1.
Demand: Ask which attribution partner they use and what lift they have delivered for similar advertisers.
Retargeting (exposure → mobile)
People physically exposed to your wrap or top can be re-served a mobile/online ad, closing the loop from the street to the phone. Top wrap and DOOH networks offer it.
Strength: Turns a passive impression into a measurable digital funnel.
Limit: Adds cost and requires the network to support it.
Demand: Ask if exposure-based retargeting is available and at what added CPM.
Brand-lift studies
A survey-based before/after read on awareness, recall and consideration among an exposed vs. control group — the classic way to measure an awareness buy.
Strength: Directly measures the point of awareness media: memory and consideration.
Limit: Costs money and needs enough spend/scale to be significant.
Demand: For larger flights, ask the vendor to include or arrange a brand-lift study.
Promo codes / QR / vanity URLs
The cheapest DIY signal: a unique code, QR or URL only on the taxi creative, so every use traces back to the campaign.
Strength: Free, direct, and yours — works even with small vendors.
Limit: Captures only the people who act immediately; undercounts true awareness effect.
Demand: Put a unique code/QR on the creative yourself — no vendor needed.
A measurement checklist for your next buy
- Set the goal first. Awareness → measure recall/brand-lift. Foot traffic → mobile-location attribution. Direct response → promo code/QR + retargeting.
- Get Geopath impressions with the audience definition — not an unsourced "views" figure.
- Require proof of delivery — a GPS/play-log report by zip and daypart for any digital buy.
- Name the outcome partner — attribution or brand-lift provider, with results from similar advertisers.
- Add your own signal — a unique code, QR or vanity URL only on the taxi creative.
- Compare on cost-per-memory, then buy — sticker CPM last.
Measuring taxi advertising: FAQ
Can you actually measure taxi advertising, or is it just impressions?
You can measure it well beyond impressions. Digital cartops log GPS play data; mobile-location partners attribute store and site visits; networks offer exposure-based retargeting; brand-lift studies read recall and consideration; and a unique promo code or QR on the creative gives you a direct response signal for free. Impressions are the starting point, not the whole story.
What is the single most honest metric for taxi advertising?
Cost-per-memory — your CPM divided by the share of impressions that become genuine brand recall. Because only a small share of impressions are ever remembered, a low CPM with weak, forgettable creative can cost more per actual memory than a higher-CPM, high-impact buy. Compare vendors on cost-per-memory, not sticker CPM.
What should I demand from a vendor before I buy?
Five things: Geopath-measured impressions with the audience definition; a post-campaign GPS/play-log report (for digital); a named attribution or brand-lift partner with past results; whether exposure-based retargeting is available and its cost; and freedom to put your own promo code/QR on the creative. If a vendor cannot answer these, treat the "views" number with suspicion.
How is OOH attribution privacy-safe?
Reputable attribution uses anonymised, aggregated and modeled mobile-location data — not individual identities. It reports lift for a group (exposed vs. control), never a named person. Ask the partner to confirm the methodology and that it is aggregated and consent-compliant.
More: cost guide · does it work? · glossary · companies & their measurement
Sources: OOH measurement methodology — Geopath; DOOH effectiveness — OAAA / Nielsen; cost-per-memory math — Digital Signage Today; per-vendor attribution/retargeting — company profiles.
Independent, unpaid guide — no company paid to appear. Methods and partner availability change; confirm with each vendor before buying. Updated 2026-08-07.