Messugga
Honorary Master
The margin of error on a BMW's speedometer is about 1% whereas most other cars its almost 10%. Also the tolerance for speeding fines at 120 means you will only start getting a fine if you drive over 129km/h. e.g. a guy driving 120 (actually 110km/h) will think a person driving 127km/h is speeding even though he is still within the allowed tolerance. So its actually the guy in the slow car breaking the law and not the speedster, therefor Keep left pass right.
You say that with an air of confidence. One I wholeheartedly disagree with. Mine differs by about 3%.