A taxi drives down the street. On the roof — a bright screen. It plays video. It changes the ad depending on the neighbourhood, time of day, even the weather. This isn’t a concept from a technology expo. This is already a familiar sight in New York, Los Angeles, Tokyo.

DOOH advertising on transport is one of the most dynamic segments of outdoor advertising. And one of the least developed in the Ukrainian market. Why this came to be and what lies behind this format — we break it down in detail.

What is mobile DOOH

Digital out-of-home advertising (DOOH) on transport refers to LED screens installed on the exterior surface of a moving vehicle. The roof of a taxi, the sides of a bus, the rear panel of a minibus. The content on them is managed remotely, updated in real time, and changes depending on the vehicle’s geolocation.

This is a fundamentally different format from static vinyl wrap branding. There it’s one image — fixed until the next replacement. Here it’s dozens of ads from different brands within a single driver’s working day. In the morning — coffee and breakfast ads. In the afternoon — delivery or financial services. In the evening — restaurants and entertainment.

Mobile digital displays stand out among all DOOH formats for one key feature: the advertising surface moves with the audience. It’s not the audience that comes to the billboard — the billboard rides to the audience. This changes the logic of campaign planning.

The global DOOH market in 2025 is valued at over 20 billion dollars. By 2034, forecasts suggest it will exceed 56 billion. The transit segment — buses, taxis, metro, airports — is among the most dynamic directions in this market. According to Grand View Research, the annual growth rate of transit DOOH is around 12% — higher than most other categories of outdoor advertising.

How it works in the US and Japan

Firefly is one of the largest operators of mobile advertising networks in North America. It installs GPS-equipped LED Taxi Top displays on the roofs of taxis and rideshare vehicles in more than 15 cities: New York, Chicago, Los Angeles, Miami, Washington, and others. The total network volume is over 60,000 advertising surfaces with a reach of more than 10 billion impressions per month.

What matters is that this isn’t “a screen on the roof for the sake of a screen.” The system tracks the vehicle’s route and selects content for the specific neighbourhood. The taxi enters the financial district — it shows B2B service ads. It heads toward a shopping centre — it switches to retail. It passes a stadium on match day — it runs a sports promo.

The results are confirmed by real cases. A cosmetics brand that launched a campaign through Firefly in four cities achieved a 43% increase in brand awareness, an 85% increase in purchase intent, and a 46% increase in positive brand perception. An automotive brand recorded a 51% sales increase among the audience that had contact with video advertising on taxis. In Los Angeles this figure reached 70%, in Miami — 65%.

A separate case — the San Francisco Department of Public Works campaign through Firefly. Over four weeks it gathered two million impressions and 625 hours of audience contact across five different city districts.

In Tokyo, the company Growth deployed a network of digital screens in 11,500 taxis, integrating them into Japan’s largest DOOH marketplace LIVE BOARD — a joint venture between telecom giant NTT Docomo and media agency Dentsu. This allowed brands to buy advertising time programmatically — just as in digital.

Uber launched its own DOOH network — more than 3,000 vehicles in seven American cities with a reach of over 112 million impressions per day. T-Mobile manages around 100,000 screens in Uber and Lyft vehicles and sells advertising through its own programmatic DOOH platform, reaching a total of 240 million consumers.

Advantages of the format

The first and foremost — geolocation targeting. A static billboard stands in one place. A mobile DOOH screen covers several neighbourhoods in a day. The advertiser can set geozones in which a specific ad is displayed, and exclude those where the display is not needed. These are geolocation campaigns in the literal sense — with precision down to the block or street.

The second — real-time advertising. Did a promotion change? Update the content in a matter of minutes. Did it start raining? The system automatically switches to umbrella or delivery ads. Did the product run out of stock? The ad is stopped with a single click. With vinyl wrap, none of this is possible.

The third — DOOH campaign analytics. Mobile network operators track impressions, routes, and audience contact time. It’s possible to calculate how many people saw the ad in a specific neighbourhood at a specific time. Some systems measure conversions — store visits following contact with advertising on a taxi. This is a level of attribution that traditional OOH never provided.

The fourth — increased brand awareness through repeated contacts. The same route every day. The same screen. Over the course of a week a person sees the brand several dozen times. Without banner blindness, without ad blockers, without the ability to scroll past.

The fifth — reaching a premium audience. City centre, business districts, airports, shopping zones. That’s precisely where taxis and rideshare vehicles operate. This is an affluent, mobile, urban audience — the very one advertisers compete for.

The sixth concerns transport operators. Installing LED advertising screens is an additional source of income without changing routes or schedules. According to Firefly, a driver earns on average around 300 dollars per month thanks to the screen on the roof.

Disadvantages and limitations

Every good picture has a flip side.

The entry cost is high. A Taxi Top LED display, weatherproofed and vandal-resistant, costs thousands of dollars per unit. Add DOOH software, GPS integration, technical maintenance, installation — and the initial costs of deploying a network become a significant budget item.

Physical wear is real. Screens travel over potholes, stand in freezing temperatures, heat up in the sun, get caught in the rain. Even devices with IP66 certification require regular technical maintenance. One faulty unit in a network already means lost impressions and lost revenue.

Regulatory restrictions are a separate issue. Different cities have different rules regarding screen brightness on vehicles, permissible content, equipment certification requirements, and obtaining permits. Launching DOOH networks on transport requires coordination with municipal authorities, and this process can take months.

Road safety. Excessively bright or animated images on a vehicle can theoretically distract other road users. This is an issue that regulators in different countries handle differently: some restrict brightness, some prohibit video content on exterior screens while the vehicle is in motion. Before launching a network it’s worth carefully studying local legislation — and building these restrictions into the technical requirements for equipment.

Dependence on scale. One screen on one taxi is not a DOOH network. For the format to function as a full-fledged advertising channel with real reach and stable impressions, scale is needed: dozens, and preferably hundreds, of vehicles. Without this threshold advertisers won’t come, and without advertisers there will be no return on investment. Entering the market requires either startup capital or a partnership with a large transport operator that already has the necessary fleet.

Where Ukraine stands

The mobile DOOH market in Ukraine is at an early stage. Digital displays for transport are still rare. In large cities there are isolated examples of LED screens on public transport vehicles, but it is premature to speak of organised DOOH advertising networks with programmatic management and geotargeting.

At the same time — this is an open niche. The market is unoccupied. Demand for new outdoor advertising formats is taking shape — especially among brands looking for more targeted tools than traditional billboards. Advertisers are already accustomed to the logic of targeted digital advertising: you set the audience, geezone, display time — and get a measurable result. Mobile DOOH offers a similar mechanic, but in the offline urban space. This is what attracts brands seeking omnichannel solutions.

Infrastructure is also developing in parallel: the number of taxi and carsharing services is growing, municipal transport is being updated in several large cities. Some carriers are already considering additional fleet monetisation. This is a potential base for mobile advertising networks.

The experience of the US, Japan, and the UK shows: such networks don’t emerge on their own. Behind each one stands a technology operator that connects drivers, advertisers, and a content management platform. In Ukraine this chain has not yet been built. But the infrastructural prerequisites are already forming — and it is only a matter of time and the first initiative.

The question is not whether such networks will appear in Ukraine. The question is when, and who will be first.

The bottom line

Mobile DOOH is not “advertising on cars.” It is a full-fledged digital channel with geotargeting, analytics, and programmatic content management. It delivers what a static billboard cannot: movement, flexibility, measurability.

For advertisers — a tool for hyperlocal reach with result attribution. For transport operators — monetisation without changing the business model. For cities — a potential channel for social communication and navigation.

The market is growing globally. Cases from the US and Japan confirm the effectiveness. The technology is already proven, the business models are tested, the results are documented. And so the question of implementation in Ukraine will in time become not a matter of debate, but of practice. And whoever enters first will not simply gain a market share — they will define that market and set its rules.