Any benefits from slower speeds and more deliberate movements are mitigated by the distraction of a conversation. Thinking along the lines of chaos theory, even the small slowdowns created by poky drivers can grow into exponentially larger traffic problems quickly. Then, when we're all stuck in the stop and go, we call someone else and bitch about how bad the traffic is. Sounds like what they've really discovered in Utah is the fuel for a perpetual motion machine. Car stops, jaw continually flaps.
[Source: Reuters, Photo: hotrodscustomstuff.com]