How do I plan a DOOH transit advertising campaign using showings and reach goals?

Short answer

Define your target audience and reach goal, calculate the impressions needed to hit that goal at your desired frequency, then divide by total available network impressions to find your showing level. From there, select formats, dayparts, and budget based on CPM to deliver those impressions efficiently.

Core concepts: showings, reach, impressions, and frequency

Before building a plan, align on four metrics.

A showing is a traditional transit OOH planning metric representing a level of market coverage, often corresponding to a percentage of available units or gross rating points in a defined market over a standard period such as four weeks. A 50-showing means buying roughly half the available inventory or impressions in a transit network for that period. Showings help communicate campaign scale in familiar industry terms even as planners work increasingly with impressions and reach.

Reach is the number or percentage of unique individuals exposed to an ad at least once during the campaign, estimated by modeling passerby counts, the subset entering a screen's viewing zone, and average dwell time.

Impressions are total counted exposures across the campaign duration. They equal reach multiplied by frequency.

Frequency is the average number of times a person in the target audience sees the ad during the campaign.

These four figures connect directly: once you set reach and frequency targets, the impressions and showing levels follow arithmetically.

Step-by-step planning framework

Set reach and frequency objectives first. Start with your audience, not the available inventory. Identify where your target commuters travel, which lines or corridors they use, and when. A concrete example: reach 40% of weekday commuters on a given line at least once over four weeks, with an average frequency of three exposures per person.

Calculate impressions needed. Multiply daily commuters by campaign days to get total journeys, apply your reach percentage to get unique exposures, then multiply by frequency.

Example: - 200,000 daily commuters x 20 weekdays = 4,000,000 journeys - 40% reach = 1,600,000 unique exposures - Frequency 3 = 4,800,000 impressions needed

Translate impressions into a showing level. Divide your impressions target by the total impressions the network can deliver in the same period. If the network can deliver 12,000,000 impressions in four weeks, then 4,800,000 impressions equals a 40% showing. This figure frames scale and budget conversations with media owners.

Select formats and placements by dwell time. High-dwell environments such as station concourses and platforms suit complex messages and longer exposures. In-vehicle screens and transit-adjacent placements build frequency during repeated commutes. Combining formats, such as digital bus kings, station LEDs, and shelter ads, delivers full-day coverage.

Apply dayparting. Concentrate delivery during peak commute windows, typically 7 to 10am inbound and 4 to 8pm outbound. Dynamic creative can swap automatically by time of day or weather conditions, keeping messaging relevant without manual intervention.

Build the budget from CPM. CPM varies by market and inventory type. Using CPM $8 against a 6,300,000 impression goal: 6,300,000 / 1,000 x $8 = $50,400. Pilot campaigns on smaller corridors can start from $1,500 to $7,500 depending on scope.

Worked example: city bus network campaign

Creative and measurement considerations

Transit DOOH creative must communicate in seconds. Use large fonts, strong contrast, a single focused message, and a simple call to action. Dynamic creative that rotates by time, weather, or other contextual triggers maintains freshness without requiring new production for each condition.

Plan measurement before launch, not after. Key performance indicators to track include verified impressions and reach via audience measurement, brand lift through pre- and post-campaign surveys, foot traffic or store visit lift using location data comparing exposed and control cohorts, and digital engagement such as QR scans tied to the campaign.

Common planning mistakes compress results: starting from available inventory rather than audience goals, running uniform schedules without dayparting, using creative that cannot be absorbed quickly, under-budgeting to the point where frequency is too low to register, and skipping measurement planning entirely.

How AdQuick handles DOOH transit planning

programmatic DOOH on AdQuick gives buyers control over placements, dayparts, and targeting with near real-time impression and reach data, so you can monitor delivery against your showing and reach goals mid-flight and reallocate budget to placements that are performing. The platform supports dynamic creative, foot traffic attribution, and brand lift measurement, connecting the planning framework above to actual campaign execution without requiring separate manual workflows for each step.