For the first time London buses can change their advertising messages according to their location, thanks to GPS technology:
'As a bus travels its route, the advertising message will change. For example, it might suggest "Find a gym in Marble Arch" and later "Discover a restaurant in Charing Cross." Marketers will now be able to highlight product promotions near their stores or drive sales of slow-moving products in individual areas.'
Via Smartmobs (via Advertising Age)