Originally Posted by Luddite
RAMBLE ALERT..!
As no one has yet asked, I think DOT as in brake fluid and much else equates to Department Of Transport..?

DOT (in brake fluid) comes from the US standard Department of Transportation test for boiling point

Can be confusing for the UK users as DOT (in roadbuilding specs) is Dept of Transport, and even MOT which was Ministry of Transport

Jon M