Quote Originally Posted by Plasnart View Post
<snip> and at 100kmh should not read more than 4.4 kmh above 100kmh. <snip>
Not true by my calculations.
Using that rule, with your true speed at 100KPH your speedo can read anything from 100 to 114KPH (basically 10% +4KPH) and comply with the ADR.
Or put another way: with your speedo reading 100KPH your true speed could be anywhere from 87.3 to 100KPH.