paul dove via EV wrote:
https://www.crimesolutions.gov/PracticeDetails.aspx?ID=38
That's a good start. But the studies it references assume the lights are
on continuously, all night.
It's not obvious what effect lights that detect people and turn off when
there is no one around would have. They have to experiment, and collect
data.
But one thing to watch out for: General Electric wanted to sell more
light bulbs to factories. So they did a study. They looked at the
historical productivity and accident rates in a plant. Then they
installed new, brighter lighting, and carefully measured productivity
again. Voila! Productivity and safety improved!
But... Then they repeated the experiment, but this time they *reduced*
the amount of light (to save electricity or cost). Again, the historical
productivity and accident rates improved!
It turned out that the workers *knew* they were being watched and
measured; so they worked harder and were more careful. The improvements
came from the increases monitoring, not from the lighting changes.
Crime statistics are likely to suffer from the same sort of bias.
For example, adding lights to 1st street might lower the crime rate on
1st street... because the criminals moved to 2nd street. But adding
lights to 2nd street (and eventually, to every street) may turn out to
have *no* overall effect on crime, since everywhere is still the same.
--
Whether we or our politicians know it or not, Nature is party to all
our deals and decisions, and she has more votes, a longer memory,
and a sterner sense of justice than we do. -- Wendell Berry
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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