Boston's billboard inventory reflects the city's compact geography and dense traffic patterns. Screens positioned along the major approaches — particularly those feeding into downtown from the north and west — capture audiences during sustained exposure windows, when commuters are predictably engaged. The mix of arterial and neighborhood placements allows campaigns to layer frequency across multiple touchpoints, reinforcing messages as people move between work, transit hubs, and residential corridors. Formats are traditional but effective, sized and sited for maximum visibility in a market where drivers know every mile of their route.