Recently a family member got pinched for 64kph in a 60 zone. He was issued with a $130 fine and lost a couple of points. This got me thinking to the often toated 'fact' that ADR requirements for speedometers are anything within +10% accuracy is legal. Well I did a bit of research and found the actual document. It's ADR1803 and the important bit from it is the following equation which governs whether a speedo is legal or not. 0 ≤ V1 - V2 ≤ 0.1V2 + 6kph Where V1 is indicated speed and V2 is actual speed. So for the people that don't like math here is an example of a legal speedo. Indicated speed is 60kph, actual speed is 66kph. 0 ≤ (66 - 60) ≤ 0.1 x 66 + 6kph 0 ≤ 6 ≤ 12.6 So this speedometer that reads 6kph more than actual speed is still legal! Yet if you were doing 66kph actual when your speedo reads 60kph, you would be fined. In my opinion this is a blatant ethical abuse by the Victorian Government. I plan on submitting this information to many media outlets and possibly speaking to a law firm about the possibility of a class action against the Victorian Police should enough interest from effected parties arise from media scrutiny. Feedback appreciated.