Billboards, whether they are of printed paper or vinyl bulletins, are good for high impact short messages. They are good for brand, or name, awareness. They are purchased on a monthly basis. The Tampa Bay Area UU marketing campaign in 2008 included billboards in its mix of media. Billboard graphics can be adapted as designs for bumper stickers.
Other forms of outdoor advertising include bus side boards, train station or subway posters, and taxi displays. All these can be effective media buys in large cities.
The two costs of this medium are the rental of the boards and the cost of producing the printed materials.