[wavefunction]

Amber lights are conducive to sleep since blue wavelength light messes with circadian rhythms so they might be useful on stretches of roadway that feature long-haul driving and late-night traffic like larger thorough fares but I think they have a very deleterious effect on animals and plants.

One of the things I love about the suburban neighborhood I live in is how dark it is at night (relatively speaking, not like being in a true night-time darkness in the wilderness).