Camera's reduce speed, reduced speed saves lives.
Not always - sometimes they actually causes accidents. On many occasions on the local dual carriageway near my home town, drivers sharply brake from 70 to 60mph because they think it's only legal to do 60 on such roads, when it's fine (conditions permitting) to do 70, the national speed limit on such roads (like motorways). As a result, more than a few shunts have occurred because people drive too close and the driver behind cannot avoid the braking vehicle in front.
I've also heard of this happening on single lane roads, plus people being reckless by significantly speeding up BETWEEN speed cameras and planting on the anchors (at vastly higher speeds than is legal) when they reach the cameras, sometimes after pulling back over to the 'slow lane', whereby the driver of the car behind has nowhere to go but into the back of the car in front when it brakes sharply.
Made worse if the 'overtaking' driver is not familiar with the area, and if you are being tailgated by another driver, even if you both are driving below the speed limit. I've had several near-misses because of the reckless driving of others in such circumstances.
People driving carelessly, recklessly for the conditions and traffic is what causes accidents - excessive speed can make them far worse, but again it depends more on HOW the vehicles are being driven and the road conditions/circumstances at the time.
A fixed lower limit (like 50mph) may be way too low in a good number of circumstances (e.g. good weather, empty road), but way too high in really bad weather in the rush hour, yet a vehicle being driven safely in the former would get nicked driving at 55 (say), one driving at 48 in the latter would not but would be at serious risk of an accident.
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