As your example shows, the speed is not the problem, the difference is. If I remember correctly, some research found the accidents to occur where people drive m

As your example shows, the speed is not the problem, the difference is. If I remember correctly, some research found the accidents to occur where people drive more different speeds rather than where people drive fast. Overtaking someone without an empty lane of separation with a difference greater than 50km/h is unsafe any day of the week. You have no time to react if that person decides to overtake someone else, if there is something in front of them that they need to swerve around... on German dashcam channels the people that drive 180km/h+ get excessively angry when someone pulls to the left to overtake a truck and I just keep wondering if they have anger issues. I get that they feel like that person almost killed them but they're the ones trying to pass someone with a huge speed differential. Perhaps we should address the differential if you want to address human safety. Put a speed camera in an unlimited section that just watches the speed difference between adjacent lanes. When too large, a cop can look at the recording and judge the safety of the situation for themselves. That's what they're doing with "smartphone cameras" now in the Netherlands: the camera spots that you are holding a smartphone and takes a picture, then 2 cops independently check the picture to see if the computer got it correct, and then you get a fine in the mail (which you can fight if you disagree).