Kilometers may be common in everyday use, but in professional navigation and aviation, nautical miles will continue to ...

An alternative (and slightly less accurate) method of calculation is to drop the zero from the km/h speed limit and multiply by 6 - e.g. 8 multiplied by 6 = 48mph.

It means that pounds, feet and miles are still used alongside the newer “simpler” system of kilograms, metres and kilometres. Road conversion into metric was due to take place in 1973.