This reminds me of a story that happened with the bachurim of Yeshiva R’ Chayyim Berlin. They didn’t like one of the staff there and they somehow had a hydrant. So every day they would find his car and put the hydrant next to it and wait for a cop to come. Once he got the ticket, they would take the hydrant away.
Honestly, as was mentioned a few times, a speed limit of 35 mph on a side street isn’t so unreasonable. Getting a ticket for going above that is unreasonable. If it’s a big street, the speed limit is unreasonable.
Avrom in MD-you misread the OP. He said you get a ticket for going above, not that that’s what the limit is.
They make things to put on your license plates that reflect the light so a camera can’t catch it. Or you could try blocking the DOT car with a dumpster or something.
I always wonder why no politician runs on the platform of minimizing traffic cops and tickets.