photo-enforced lights can suck it

[inertiacage]

"What matters most for road safety? The quality of the roads themselves? The engineering of the cars that travel them? The speed limit? The answer may be “none of the above.” In 1949, a British statistician named R. J. Smeed, who would go on to become the first professor of traffic studies at University College London, proposed a now-eponymous law. Smeed had looked at data on traffic fatalities in many different countries, over many years. He found that deaths per year could be predicted fairly accurately by a formula that involved just two factors: the number of people and the number of cars."

http://www.theatlantic.com/doc/200807/traffic