Anywhere there is blank space an advertiser is willing to fill it. According to the Associated Press, NYC will be testing digital display’s for ads on the side of buses. These ads will essentially be rolling billboards. The cool part is that they will offer dayparting/GPS parting to allow the advertisers to display different messages at different times of the day in different neighborhoods. What did advertisers do before the days of such precise targeting? The answer is, they wasted a lot of money. The ads will be sold by Titan Worldwide (an outdoor media company).
How long before Google buys up this inventory and sells it through Adwords?
Answer: Not very long at all. 1 year tops.