I feel that people driving at widely varying speeds on the same road is more dangerous than everyone driving at the same speed even if it is faster. What I would like to see is clarification of the speed limit. Who else remembers the woman that was arrested a few years ago for going too little over the speed limit and holding up traffic? The speed limit should be exactly that, the limit. I expect that with self driving cars programmed to severly limit speeding taking to the highways that speeding will become much more challenging and probably more dangerous. If the limits were actually enforced they could probably be raised 5-10mph and the roads would still be safer.
How about a different solution to the problem of heavy vehicles not being able to stop? All vehicles must be able to pass a brake test on request! A Ford Ranger pulling a 3,000lb trailer with no brakes is legal in most states but is probably more dangerous that the new F450 pulling a 32,000lb trailer with good brakes. I have been very impressed by the brakes in my DP that weighs 25,000lbs. Even so, I will not pull a trailer without brakes. On more than one occasion I have been glad of that.
