My favoirite of all time was a huge sign just outside halifax (must have been 20’ long) with the words picked out in reflective cats eyes.
DANGER OLD PEOPLE
I always imagined them lurking in the bushes waiting to pounce on unsuspecting motorists.
I loved the matrix signs whilst coming down the M1 early Friday morning 22/08/08
For a few miles southbound they were showing 50 MPH
Lane Closed (Overtaking lane) or outside lane…fast lane or whatever
Only to find a broken down coach on the hard shoulder…with another one in front to transfer the passengers…and 2 highway patrol jeeps all lights blazing…