I actually had a CB base station and a huge CB antenna in my backyard when that stuff was popular. I tried to use CB frequencies that weren't so popular, because anyone could listen in on my conversations. I tried to use some of that CB talk, but truckers kept changing it around because the police were monitoring the channels. If they suspected the truckers were trying to form an illegal convoy or avoid speed checks, they would start pulling people over.
I had a CB transceiver in my car for a long time, mostly so I could contact emergency services if my car ever broke down on the highway. I haven't used it in years, but I'm sure someone would still be listening for breaks if I ever had to use it again.