I'm looking at unit converter and it seems US uses different volume units for almost everything.
http://www.digitaldutch.com/unitconverter/volume.htm
-bushels, UK vs US
-fluid ounces, UK vs US
-gallons, UK vs US dry vs US fluid
-pints, UK vs US dry vs US fluid
-quarts, UK vs US dry vs US fluid
It's probably not a big deal since you generally don't need to use the speed limits for calculations or tolerances. Switching the speed signs between mph, km/h, or penis lengths per minute would make no difference at all.
Where the imperial system kills me if shit like feet and inches where you need to work with both at the same time using a standard base 10 number system (0-9) but neither of them is a base 10 unit!!! GRR!!!112lkj;alisdjkf;lie
I would be perfectly happy using inches if they were kept base 10. Instead of saying 5+11/16 inches, write it as 5.6875 inches. I smash my head against the wall every time I need to enter fractions in AutoCAD or when I need to add fractions when building shit. Seriously, just use decimal inches. Decimal feet. No more stupid fractions.