... one of those looming overhead electronic noticeboards warns you of a height restriction at the Dartford Tunnel:
15 Feet 9 Inches
Momentarily, you lose control of your vehicle as you desperately try to work out what that means. OK, you know you have entered a pre-modern society where they do miles and fraction of miles. But "15 feet 9 inches" in flashing lights...
This fantasy sign was flashing as I drove home from Folkestone last night. I found it surreal. I hope it didn't cause any accidents. Or block the Dartford Tunnel because someone wasn't quite up to the conversion. ( You think you can do it? Go on. Try. But not while you are driving)