Pretty cool concept. I am not sure this can go mainstream though!

BUMP was born in August 2009 when we realized that for many, time spent in the car is wasted time. The web enables us to be constantly connected with business associates, friends, and family whether we’re at work or at home. But what about when we’re on the road? Every day, 128 million American drivers spend an average of 46 minutes commuting. We’re right next to each other on the highway, but we have no way to communicate, connect, and network. BUMP empowers you to break the communication barrier, creating a world in which it’s possible to connect with anyone, anywhere, at any time. Best of all, it’s simple, safe, and effective. With BUMP, downtime need never be wasted time.