I don't think you're disagreeing with the article's premise. Your "horrible drivers" can include people who either drive far too fast or far too slow, thus creating a speed differential. Lt. Megge's idea concedes that you can't get the fast drivers to slow down, but maybe you can get the slow drivers to speed up.

(Aside, I agree 100% about more rigorous licensing. I spend 3 hrs on the highway each day; easily 80% of the drivers I see are utterly incompetent: texting, driving slow in the left lane, passing on the right, lights off at night, falling asleep, etc. Heck, I saw one driver eating out of a bowl with both hands.)