Adam and Jamie tackle key congestion questions and unlock the traffic gridlock. They find out if a minor unexpected braking incident can really cause a major â€˜shockwave jamâ€™. They also put the European roundabout up against the typical American four-way stop sign to see which is really the most efficient. Meanwhile, Kari, Grant and Tory take on the controversial claim that on a journey of less than 600 kilometers itâ€™s always faster to drive. Plus, can lane changing put your life in danger?
Aired: 7 Aug 2014