You hit the nail on the head when you said "MOVE AT THE SPEED OF TRAFFIC". I've been commuting 30k+ miles per year for over 20 years now and I've learned that the worst and most dangerous drivers on the road are SCARED drivers. I can usually predict the actions of speeders and fast lane changers but the white-knuckled scared to death drivers going 20mph below the flow of traffic are the absolute worst and most unpredictable. These drivers often use the claim to fame that they've never been in an accident or "it's been 50 years since I had an accident". Although they haven't been involved directly in one that doesn't account for the massive pile-ups they've caused in their rear view mirror due to other drivers being forced to slam on brakes because of them. If people are too scared to continue with the speed of traffic, no matter that speed may be, perhaps they should hang up the driving gloves and call Uber.