I was driving along the left lane of the interstate one day, a hundred miles north of Chicago, 20 mph over the limit, passing many cars. I noticed a car behind

I was driving along the left lane of the interstate one day, a hundred miles north of Chicago, 20 mph over the limit, passing many cars. I noticed a car behind me in the left lane, not terribly close, but who hadn't been there before. I assumed he was catching me quick, and started looking for a gap in the right lane. I checked my mirror again a second later, he hadn't gotten any closer. I thought this odd, but continued in the left lane - the right lane was packed, and he was still a solid ten or fifteen car lengths behind me. After a minute of this I found a three car length gap in the right lane, and pulled over anyway. He was past in a flash. Canadian plates. Not that he didn't want to get around me, he was just too polite to tailgate. :)