Whilst I understand why they are there, I fail to see how my safety would be compromised by driving at say 10mph faster than the antiquated speed limit set before tyres had air in them, on a long straight and wide road with no other vehicles in sight. Cars are better able to cope with increased speeds nowadays, better braking systems, road handling and built in safety features. There is however no excuse for dangerous driving/overtaking at any speed which will be the likely cause of many accidents. Tiredness is also a killer.
Speed cameras may save lives in city centres, but on rural roads do they really make a difference other than the polis funds at the end of the year. Circumstances play a big part in accidents, it's not so easy to crash into another car if there are no cars near you, yet the punishment will be the same. Money for old rope.
The polis would be better off sorting out the crimes on the streets where some of the youngsters today are out of hand. Drugs are rife, fighting in the streets, burglary, murder, stabbings..........where are the cameras now.