Hell, here in Indy on I-465 I do 70 all the time. 55 is posted, and have had troopers/sheriff's pass me. Everyone on 465 does 70. Not a rural road.
One summer day a few years ago, I was on 465 headed west to I65 (no 865 then) and was going 80 mph just to keep from getting run over. This was about 3:30 in the afternoon, so traffic was starting to pick up.
About the time I got to Michigan Road, I saw an Indy cop had someone pulled over--while the rest of us continued to fly by. How the h*ll the cop picked this guy out of all of us to ticket, I will never know.