hi we had the same problem and we live near a school, i bought som some large rocks from the garden centre and i placed it on my drive around the area people were using to reverse in, i made it look like attraction piece, and it worked, coz they are low down and heavy and could damage a car if driven over them, but which idiot would do that eh.......only one person ignored it and it was stuck under his car, my hubby helped him out, but since then we never really had a problem with it as they are unavoidable.....hope you sort it love