@Nic
"If your child was run over by someone speeding you would soon change your tune."
Whilst yes this is a very tragic situation, it is also fairly rare. Those who do get run over are more likely to be run over by someone doing the correct speed, and likely because the child has run out between parked cars etc.
The vast amount of speed controls around residential areas are based on FUD causing parents to kick up a big fuss based on a statistic which places just breathing air as being more dangerous than a child crossing the road! (and we don't ban breathing do we?).
Not that I don't agree with reducing speed in residential areas just in case though, but speed cameras as a solution is the worst solution. It causes anger amongst drivers and they will often accelerate once past the camera as an act of defiance, or just see the camera as an annoyance.
In the case of the child and the parked cars, there is a good/better solution there. Deal with the inappropriate parking of cars, or provide better parking solutions. Or, reduce the number of Chelsea Tractors and people can see better down the road. Likewise, stop these parking near schools where kids are more likely to be on the road.
The best solution I have seen though is the electronic warning sign. A lot of these have sprung up around Surrey in the last year or two, and the impact is huge judging by the behaviour of drivers. Locally, not only do most people slow down on seeing them, but they remain at that speed also.
However, the majority of accidents occur at junctions and on roads with sharp bends (regardless of speed) and most in my opinion are caused by lack of concentration and judgement.
On my way to work, there is one very bendy road that causes a lot of accidents and claims numerous lives per year (just have to look at the amount of flowers on the trees!). The problem is with the road and a lack of driver education. I have seen a near accident on the same road and the driver was going well under the speed required for the road but somehow still managed to lose control. Likely was paying attention to the radio, his phone, etc, than the approaching bend. It also doesn't take much speed to be killed on impact with a solid tree.
The best solution is to take the bends out of the road, or reduce them.
Surprisingly though this road has never had a reduction in the speed limit from national limit, or speed cameras. Why? It's out in the sticks. Not next to someone's house where a hypothetical child can run out into the road and thus justifies a residential campaign to get speed controls. And yet the number of children run over in the area amounts to less than this one single road has claimed in lives over the last year!