Wisconsin Drivers
Over and over again on their freeways, a car would pass us and then move over, a car length or two in front of us. A couple even slowed down. So we had to back down to reestablish a safe interval. (I use the 2 second rule.) In effect, we had to finish their passing maneuvers for them.
This happens a little everywhere, but in Wisconsin, this seemed to be the rule, not the exception. The only question was why, and I developed a theory.
Wisconsin as you hopefully have only heard, not experienced, is fussy about speeding. We saw several cars pulled over, in fact. Between that and their keep right except to pass law, maybe their driver are a bit more cautious, feeling exposed in the left lane doing 3 mph over the limit.