Left 4 Dead Ads Infect San Francisco Subway

While advertisements for Bethesda's Fallout 3 appear in Washington DC's Metro Center station, Shacknews has discovered that a variety of ads for Valve's Left 4 Dead have appeared on the opposite coast and infected the San Francisco subway system. nope

The advertisements are part of Valve's massive $10 million marketing campaign for the cooperative zombie shooter, which arrives in PC and Xbox 360 form on November 18.

The subway ads join a L4D billboard in Seattle, WA, recently spotted by fansite Left 4 Dead 411, with Shackers melkore and Darkfox76 reporting that more billboards are located in Chicago, IL alongside Highway 94 and Vallejo, CA alongside Highway 29.

For more on Left 4 Dead, check out our recent hands-on preview with the playable undead and interview with Valve marketing VP Doug Lombardi.