No it's not too hi-tech.
The picture of my car on the cops smartphone was clear and speed indicated.
Sure they are linked.
Up here it usually happens before reaching a district town with the police box/station roadside. Short walk to the cashier
I was about 20 km/h over the limit and paid 500.
I still don't quite buy the story of 4 km/h over.
120 being allowed on highways is an exception on a few stretches with specific features (completely "fenced", separated, no junctions or intersections like motorways).