[Plums]

There's a bit of a trick in the ADR regarding speedo accuracy. It's allowed to be -10% but only +1%. I.e. at a true 100 kph your speedo can read anywhere from 91 to 101 and still meet ADR's. Most speedo's are somewhat conservative, usually a speedo reading of 100 kph is normally a true road speed of around 95 kph....