Back in the 80's there was a nationwide group called REACT that was on channel 9, which was monitored by police departments. As a traveler you could call for help due to break down, flat, etc. and within minutes, someone was to your location. Channel 19 was for truckers who told each other about road conditions, accidents, conversations to avoid being tired, etc.
The sad thing is with the advent of cell phones and gps, cb has died off for most. You can still get them at truckstops and they can't be beat for group talking, everyone can hear each other at the sometime, like sitting in a room talking. There was a code of ethics and everyone took their turn talking, called roundtableing. What memories.