Require no-idling technology in all new cars

Idle start/stop systems shut a car down when it is idling. Since idling causes unnecessary emissions, why not do more than encourage drivers not to idle?

Some cars already have this technology, such as Toyota Prius and Mini Cooper. And some car manufacturers are already planning on using this for all their cars in the future, such as Mazda and Ford. We should require it of all new cars.