[ljf]

How do the cameras cause the crash, and not the lights themselves? Is it that the flashes of the camera causes people to brake suddenly, or the very presence of the camera causes some people to brake at the lights and others not to?

I find it interesting, as in the UK we don't have loads of red light cameras (though we do have them) but people driving through red lights is a rarity - even when there is no-one around and at night, the vast majority of people will obey a red light.