Two more people who've actually marshalled in races on the Turner Landscape thread explaining why the rules about having numbers pinned, unfolded to chests/fronts of vests is much easier to read than folded numbers on shorts.
I see I've opened the can of worms on metric again. It's boring. We are a metric country. Time to stop using archaic measurements. Worst thing we ever did was leave road signs in miles. If they'd been in km, then no-one would use imperial measurements any more at all.
If you want to know why metric is important, then have a look at an OS map or Harvey's Map or any other form of map. Km grid squares with contours in metres. Unless you have a map from before the early 1970s, which might be imperial. In which case, it'll be so out of date it's useless anyway. Time to enter the 20th (never mind 21st) century.
And if you absolutely have to know in imperial units, and you can't do 1km is approximately 2/3 of a mile, then I worry for the future...