A decade or so from now, you may find yourself traveling along an interstate in a caravan. Your automobile is separated by just a few inches from the vehicle in front of you and the one behind as you speed along at 150 miles per hour.
As another vehicle enters the interstate, your car and those following you simultaneously slow down to create a gap just big enough for the new vehicle to slip into the caravan. Then the gap closes back to just a few inches. On the way to your destination, your vehicle leaves and joins a series of caravans in the same manner.