Having just driven from Dallas to LA, I can speak for this concept. You simply can't avoid traffic waves, from an individual perspective. Autonomous cars will

Having just driven from Dallas to LA, I can speak for this concept. You simply can't avoid traffic waves, from an individual perspective. Autonomous cars will solve this someday, but this simple idea seems like it could work. I'd like to see how it works when some drivers have the tool and others don't.