Has anyone tried calling the police and give them permission to sit on your land to hit the speeders with radar? We did that at my folks place where there is a blind corner with a narrow bridge. Had some bad accidents there over the years and one guy even smashed through the railings on the bridge, but lucky for him his truck stopped him from a 30ft fall into a small river. We let the police sit at the bottom of the driveway and they nabs speeders every timethey sit there, by the time they see him it's too late. After a few $300 tickets the regulars start slowing down , and the cops love it because it's like shooting fish in a barrel. I agree with Wolfman about the liability of building your own traps. If they crash you could be liable even if you put up signs. It's a toss up who would win in court but it's a guarantee that it will cost you $$$ to hire a lawyer to defend yourself.