TechCrunch | Gap Campaign Rethinks Old-School Bus Station Ads | Psychology of Consumer Behaviour |
It's not just startups that are trying to push what's possible with mobile advertising — the Gap recently completed an ad campaign combining traditional transit ads with geo-fencing technology.

-ads at bus stops and other transit locations in New York, San Francisco, and Chicago had  geofences around the ads, which activated the mobile part of the campaign for people who were nearby. 

-you might see a Gap ad at a bus station, then while you’re waiting for the bus to arrive, you open up Words With Friends, which serves another ad, this time with a coupon for $10 off a $50 purchase. (If the app is running in the background, the ad could still deliver if you open the app within two hours of leaving the area.)