car - car

Just wondering what frequencies the Jackson County Sheriff talk on for car to car chatter. I am guessing it's 154.1000 or 155.9700, but I never hear car to car chatter. I Monitor: (all w/ PL156.7 tones) 155.7900 Dispatch 155.9700 cars to base 154.1000 Tac Am I missing something? or...