Hey all. Thought I might share a little tale which happened on friday public holiday. Long read; my appy-olly-gies I'm in Brisbane btw... I went for an early morning rollerblade, and went down the series of hills (given terrace) which takes me to the brisbane river, so I can continue into the city along the river (very pretty bike paths there). I spot a person who I instantly assume is some university student that has set up a camera ontop of an overpass (Hale street is the street which goes "Under" this bridge). I was curious so I asked what he was up to... I then notice the CB radio on his shoulder. He was in a pair of rugby shorts, with a jumper on. He responds to me "I'm a police officer, and I'm gunning people with my radar". I say "oh right... sorry mate. I thought it was a camera" he says "yes, it has a camera on it" I say "So do these photos actually get used in law proceedings?" "Yes they do" he says. I was a bit confused as I'd never seen a mobile speed camera outside of a vehicle (usually a landcruiser 4x4). So I continued down hale street a bit further, which is where I see a ton of uniformed police pulling people over (must have been a great revenue generating day for them). So, after all of that he was taking radar measurements for police down the road, not for actual prosecution with his camera. Now I've thought on this for a bit, and I'm hoping that the more legally erudite folks amongst us could provide some insight; because as far as I was aware the police radar must be on the same "plain" as the vehicle which is approaching it. But in this situation (which is policeman on top of bridge, tracking cars which are travelling DOWN HILL underneath him) surely it means that the closer the car gets to the policeman, the more inaccurate his radar measurement would become? I know, in this situation the radar would be registering less km/h than their actual speed, but as far as i was aware the police radar readings ARE REQUIRED to be as accurate as possible, hence taken from the same level as the travelling car. What are your thoughts?