They've been doing this for some time now
Sun, 11/22/2015 - 12:53pm
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    16 years
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This is an alternate to Red Light cams. Bright Blue lights that are placed above the traffic light and are bright blue for 360° when that light is Red. Don't need a camera, but you do need a police officer there to see it.
http://www.dailypress.com/news/traffic/dp-nws-blue-lights-10...
another alternative
Increase the length of yellows to reduce accidents. But that costs nothing and makes nothing either. It is not about safety, it is about $$$,$$$,$$$.
In FL
I saw these in Florida (Orlando area I think) a few years ago and didn't know at the time what they were for. I had to look it up when I got home from the trip.
Alan - Android Auto, DriveLuxe 51LMT-S, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra, Bosch Nyon