Driving around the UK I've noticed that the matrix boards on motorways are often showing the time and distance to the next junction.
Surely the time to any particular point depends on the speed at which you're travelling? (if the distance is 10 miles, at 50mph it'll take 12 minutes, but at 75mph it'll take 8 minutes).
Isn't it just a waste of electicity and a case of "if you've got nothing useful to say, say nothing" ?
