Interior bus advertising offers significant value to advertisers, providing high-frequency exposure to regular commuters and ample space for detailed messaging as passengers typically have time to read during their 30-40 minute journeys. With growing environmental awareness and popular programs like Park-and-Ride, more people are opting to park at malls and use buses for their commutes, making interior bus ads highly effective.

Available in most of the top 100 markets, interior bus advertising's effectiveness can be measured through circulation estimates based on monthly passenger counts from local transit authorities. Additional marketing data is also accessible through vendors. Advertising typically involves purchasing GRP programs, which reflect the percentage of total ridership exposed to the ads. Copy must be refreshed every 12 weeks, so a quantity of posters equal to the program size plus 25 percent should be supplied for each 12-week period.