In our quaint little island across the pond, which measures only about 850 miles top to bottom, we have about 6000 speed cameras of which 2500 are mobile. You are given a 10% margin of error when caught on camera. The penalty is a £60 ($100) fine, 3 penalty points on licence (collect 12 points and licence is withdrawn). You may or may not be offered a speed awareness course (at a cost) to avoid penalty points. You can of course dispute the offence in court, but this caries the risk of losing and being liable to all court costs and still losing your licence.
As an aside, motoring offences committed outside your own country of residence, can still be enforceable by other EU countries.