Have mine on most of the time when we are driving to friends and realtives. Keep it on 19, as we travel on motorways and A roads.
I know the truckers don't use them much any more, but last time we were caught in a traffic jam on the Northbound A34 (last week) truckers in the Southbound lanes were keeping us informed about what was happening, and it was good knowing it wasn't a major crash, just a broken down car blocking one lane.
But normally all i pick up is idle chitter chatter.
For what it's worth it was worth all the while
It's something unpredictable but in the end is right
I hope you have the time of your life
Green Day - Good Riddence (Time of your life)