"However, there is no magic 10 per cent formula, as some people believe. In fact, when police are conducting an “operation” in areas that are known for speeding, they may indeed pull people over for driving just a few kilometres over the speed limit."
This isn't true in Edmonton. Ask the Crown Prosecutor and he will tell you that city cops will not ticket you if you are below an imposed limit. The limit? 14 km/h above the posted limit. You'll notice here, in this berg, that you'll never get a photo radar ticket or speed trap ticket unless you're 14 km/h or greater over the limit. That's mighty white of them but what it really comes down to is; How much will they lose when everybody starts contesting small tickets? They've carefully calculated the point of maximum return with minimum expense for their little scam (read: photo radar).
It's all a scam anyhow and they've turned peace-makers into state funding agents as Power2Weight said. Hey, it's your country. If you want to do something about it then...do something about it. We have the system we deserve, I guess.