I haven’t seen the exit ramps used as a passing lane. That must be interesting.
I have seen one driver try to use a rest stop as a passing lane. I was behind the vehicle on I-35 northbound in northern Iowa. Vehicle was observed making multiple vilent lane changes, so I was on the phone with the State Police dispatcher. The driver then pulled off at a rest stop, blew through, and somehow wound up just behind me. At that point I could read the plates to the dispatcher. Passed me again, continued to make lane changes. The dispatcher asked me to safely follow the vehicle, stay on the line, read off mile markers, and exit when the vehicle exited. The staties must have been really interested in this one.