Yup, I've heard the pop legends about how people call things by their brand names. All soft drinks are cokes, too, right? But in actual life, I have never met a person who did this in casual conversation, just lots of people telling me that other people don't know any better.
From the description, the Australian driver was clocked between two points, not measure on radar. Nevertheless, police traffic radars are another source of an endless stream of urban legends, some of them even true!
Considering the gazillions of police radar guns in use today, it's not at all surprising that some of them can be out of calibration. Of course, any radar gun will give you any silly reading you want if you play with its zero point.
For a good time, talk to Scotty about radar guns. He earns his living testifying in court about the accuracy of those things, on behalf of Stalker Radar.
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Who are all these people and what do they know? 
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