People who can't keep their car at a constant speed on the highway; cruise control is the best way to do this if you don't want to keep checking your speedometer. To elaborate: If everybody picks a slightly different speed and maintains it , any encounter between two vehicles will never last very long. There's more distance between any two vehicles, so it's safer, and large, impassable clumps of vehicles are less lik…
I'm starting to think that there are a large number of people that feel some sense of comfort in these groups. Something that I've noticed is that a passing car will often slow up as they are passing another car so as to pace them. It drives me crazy.