Tunnels ??

Question

why are lights in tunnels orange

Answer 1

They're Sodium-Vapor lamps, that are brighter and more efficient than Mercury Vapor (blue-ish green-ish light), flourescent or incandescent.

Sodium-Vapor lamps naturally give out orange light. In NYC most streetlights are Sodium-Vapor. They used to be Mercury-Vapor, you still see Mercury-Vapor in some suburbs.

Answer 2

because their more visible than clear ones would be,and last longer because of the design of them,and they don't instantly blind you when you enter the tunnel,bright lights in a tunnel would cause problems when you came out the other side,it would be like going from dark to light all the sudden,good luck.

Answer 3

because the covers are tinted