Thanks guys for your replies to my question. All very confusing at first one wonders why they can't just adopt KM and be do e with it . Road building Eg the recent A1(m) project t in North England was measured in Km . Crossing from North Eireann back into the republic it's km from miles . Railway projects often seen to qoute Km too. Isn't it mainly Us and America that still use Miles ? .