The UK uses metric in pretty much every avenue of life, except notably on the road, where yards and miles are used.

Except… Not really. The Dept for Transport measures distances in metres, but then changes the unit to yards. Not convert. Change. That is, a sign that says “roundabout 300 yards” has been measured at 300 metres, but the units simply switched to yards.

The UK also measures in fractions of miles (eg ½, ⅓)… Except those are done in metres too! ⅓ mi is defined as 500 m (reality: 533 m), ½ mi is 800 m (reality: 804 m) and ⅔ mi is defined at 1000 m (reality: 1070 m). The only unit that is actually imperial is 1 mile.

So the UK uses metric in distance markings, but then haphazardly converts them to a vaguely approximate imperial equivalent. Madness.

But now it gets even more strange. The UK does not use mile markers on motorways. It uses km markers, at 500 m intervals, with the number of km since the start/end of the motorway, but no units are given. But it’s in km. Not miles.