J.L.
A.,
You don't say where you live, so I'm not sure if this will work for you. I live in Hillsborough County, and we called the sherriff's department to ask if there's anything we can do about chronic speeding on our very narrow road. They immediately sent out a community service officer to check out the situation. He saw the problem and was eager to help. He has arranged to have more speed limit signs posted, and to personally visit anyone who speeds frequently. You may make some progress if your town has a community service officer. We were very impressed!
Good luck,
J.