They don't have to catch you on radar to give you a ticket. I got a ticket in the Typhoon for "Failure to obey a traffic control device". The "traffic control device" was the speed limit. The officer had no way of knowing how fast I was going, but he said my engine was racing and I looked like I was going faster than the other cars.
I fought it since there still was no real proof that I was exceeding the speed limit (I'm not even sure I was), but the judge sided with the cop.