Ummm… aren’t roadway speed limits posted in miles/hour in the UK (or Britain/England or whatever is the appropriate geopolitical term)?
I think imperial, with all the fractions, is good enough when great accuracy is not required, e.g., lumber measurements, which aren’t even what they say they are (2x4 is something like 1.75"x3.5"). But like analog clock faces, much easier to read at a glance.
As a Canadian of a certain age (I was in grade 5 or so when we switched; do the math if you care), I’m still comfortable in both. Fully converted to Celsius, because it’s something you “feel” directly. Fluent in feet/inch, but really enjoy when I got to work in a fully metric shop. Which oddly occurred more often in the US than in Canada.
The sheer quantity of existing machinery and measuring tools out there ensures we’ll (Canada) be stuck in a mixed system for quite a while longer.
