...motorways in the UK had no speed limit.
And then there were a couple of high-profile crashes, plus the famed Jaguar 190MPH road test, and the Powers That Be took a Ford Anglia, decided it went a bit wobbly and scary at 70MPH, and said "Behold! The Speed Limit!".
And so I get to drive on the motorway in my 1999 car (that's made by Germans for the Autobahn, and is somewhat better than a 1965 Ford Anglia) at a frankly ludicrous 70MPH.
Well, that's the official line, anyway. Repeat after me: "I always drive to the posted speed limit, oh yes indeed".