Don't you guys watch Mythbusters? They sorted all of this stuff out years ago - nothing works......
Tickets suck and they are revenue raisers for sure (here in Melbourne Australia they have speed cameras mounted to the front of civilian cars and you have a 3km/h (2mph) buffer. They catch you doing 84km/h in an 80 zone and it's $150)
However don't speed and don't run red lights and you never have a problem.......