By now you’ve probably seen digital billboards flashing advertisements on the side of the highway, videos playing on gas station pumps, in elevators and on the backs of airplane seats. As Advertisers look for new ways to market to captive audiences, technology is helping to pave the growth path. One company, Electrify America has just struck deals to install electric vehicle charging stations at two big retail chains, Target and Walmart. As part of this agreement Electrify America is looking to possibly sell video ad space on their charging stations.