A couple of years ago, while driving to Kansas City, we came upon a car that was being driven erratically....weaving all over the road. I stayed behind him waiting for an opportunity to pass. A couple of cars that passed him almost had an accident. After a couple of miles of this, I had the wife dial 911 on the cell phone, and gave the dispatcher a description and location of this car, and stayed on the phone for several minutes until I saw the red lights of a highway patrol car coming up behind us. The patrol car, with lights and siren blasting, took a fair amount of time and distance before this goofy driver finally pulled over.
I never found any info on this incident, but I suspect the driver was either quite drunk, or high on drugs. It's a wonder that he didn't cause a bad accident. Had he spun off the road, and crashed himself, with no other vehicles involved, I would have probably cheered.