Colors of Solar Barricade Lights

Next time you are on the highway, check out the colors of the solar barricade lights you see.  Chances are, 90% of the time they are going to be yellow/amber.  This is because it is the most popular for roadways.

If you work at an airport and you see construction, chances are you will see that the solar barricade lights being used are all red.  This is because it is an FAA spec for construction lights for airports to be red.  Interesting what you can learn, huh?