[masraum]

I suspect it depends upon where you are. I assume police in those countries treat kph like our cops treat mph. You're probably pretty unlikely to get a ticket for 6mph over in the US, but maybe if you're in a 35mph zone or it's the end of the month and the cop hasn't met his quota. It can happen. I've heard of folks getting pulled over for less. In those cases, I'm assuming the cop wants to pull over a specific person and is "looking for a reason".

I have very little experience with speed cameras.

Speeding tickets in my experience don't come cheap. In my little local town, a speeding ticket fine starts at $220 (0-10mph over) and goes up from there.