I live on a corner and I built a circular driveway so I could come out or enter onto either street. Now idiots use it as a short cut or to do a u-turn. I'm afraid my son will be out there some day and one of these idiots will run him over. So I'm looking for ideas to discourage trespassers and rude people but still leave it open for me and company. Tire spikes? Electric gate? No trespassing sign? Cameras? I need some ideas.