There are no laws against parking on private property so nothing the police can do. Code enforcement will be happy to drive by, maybe send a kind letter,but they have no authority to enforce a code violation of this nature......see all the other lawn parking complaints on see click fix....... but if you have a blade of grass above ten inches they will post an 8 x 10 paper sign on your lawn. So code enforcement is the one to call if you want to see if your blade is ten inches or bigger.