Like most upstanding citizens, when we get a speeding ticket, we pay it. Without thinking. We are not inclined to question authority. Especially not the authority of the CHP.
However, when my wife got her third speeding ticket in the same place, on Barnes Road between River Road and Dennis Lane, in Santa Rosa, I thought, "Wait a minute—something's wrong here." I began to research. And thanks to David Brown's book How to Fight Your Ticket and Win, I learned that if a radar speeding ticket is issued in a location where the posted speed is not justified by an engineering speed study, the ticket is illegal. (See California Vehicle Code