Crazy how 38 mph seems to be that magic number here in the NE USA as well, on any 2 lane road. Must be a human trait! There was a time when every single day on the way home I would be stuck behind a couple of those 38 mph drivers, mind you this was 45-50 mph rural 2 lane road with no lights or significant number of driveways or other hazards along the way. Brutal part was the 10 mile stretch of no passing zone. When you finally make it to the solo short passing zone and get around the road hog(s), there is a 25 mph flashing school zone just a couple of miles ahead. I would slow down to near 25 mph, and what do you know the same jerk is right on my bumper still trying to do 38! And this was every single day! It got to the point where I would slow to a crawl on purpose (staying literally at <25 mph through there) simply as payback for them delaying me getting home for the past 10 miles. First world problems I know.