Traffic Waves
When Dad was teaching me how to drive, he told me to pick the speed I wanted and stick with it on the busy highways.
The roads have got a LOT busier since then, but I find that if I follow Dad's advice, I don't get stuck in clusters where people accelerate to close the gaps and then brake because they are following cars instead of following the flow of traffic. I may seem to fall back a bit compared to some, but I get to my destination just as quickly as they do.
If they do a bit more of what the guy in this video suggests, busy highways will work better as people move with flow rather than compete to save a quarter of a second.