Let's be honest about it: phantom traffic jams are real, happen regularly, and look impossible to prevent, especially because all it takes to create one is a single car slowing down. Phantom traffic ...

I drive a lot of DFW, area well known for heavy traffic. Often when everything comes to a stop on a freeway, I wonder why. It's a beautiful day, there are no wrecks, yet traffic is bumper-to-bumper.