DMV near me is 10MPH. It is a long road too.
Around where I live is 25 MPH is fast for this area, and yet on a major road they have reduced the limit to 60 when it was 65 for no reason , except to give tickets.
One of my earliest disputes on FR was with someone who was convinced that speed limits were handed down from God himself (he wasn’t clear on the libertarian ethos of FR, apparently). He claimed that if everyone studiously drove the speed limit then most if not all accidents would cease and that traffic would flow more smoothly.
Then some students in the Atlanta area made a timely video entitled ‘A Meditation On The Speed Limit’ in which they did exactly that: drove the exact speed limit in every lane on a typically busy Atlanta highway. As you’ve probably already guessed, absolute chaos followed with backups (even more than usual), horns blowing, cursing, and people doing insane things on the shoulder and median to get around the ‘pace cars.’
I linked to the video and our plastic FReeper didn’t have much of an answer to it.