As someone who averages about 2,500 miles a week on UK roads I'm constantly irritated by the messages displayed on the motorway matrix signs.
One of the regular messages when it's raining is "SPRAY SLOW DOWN". Now, I'm travelling in a vehicle on the motorway. Don't they think I can SEE the spray? And, why are they telling me to SLOW DOWN when they don't even know what speed I'm doing ?
Another one of they're "useful" messages is "JX XX MILES - XX MINUTES". What speed do they use to make that calculation ? There are vehicles travelling on that road at anything between 40mph and 80mph. Why even bother to put that information on the matrices?
How many of us have travelled for miles on a motorway with the matrices displaying SLOW - WORKFORCE IN ROAD or SLOW - DEBRIS ON CARRIAGEWAY only to reach a matrix displaying the word END without having seen any sign of debris or a workforce ?
A couple of the favourites in the Glasgow area seem to be either CHECK YOUR TYRES or CHECK YOUR OIL. I bet it would cause apoplexy in the control rooms if several hundred motorists all took the sign at face value and stopped to complete those checks.
How about DRIVE TO THE ROAD CONDITIONS ? Another favourite north of the border. Perhaps I'd get away with driving at 130mph at 3am in Scotland because the road conditions were ideal ?