To anyone who thinks there is any kind of technicality in California where you can talk your way out of a speeding ticket or won't be pulled over by the CHP for speeding due to one reason or another, I hate to disappoint you, but the State of California is broke due to squandering all it's tax money, thus they have lately became far more concerned about "public safety" and currently have the CHP handing out speeding tickets much more aggressively than they have in the past. I believe you will find your, "I was just going with the flow of traffic defence" just about as effective as the "I'm not used to this rental car" defence.