Maybe you are seeing just a bit into the ultraviolet spectrum. Halogen headlamps emit a lot of uv light. When uv hits reflective paint, the wavelengths are probably lengthened and may make it just into the edge of visibility for some few people who are very sensitive. One clue is that you are seeing it as purple, which is the color closest to the UV spectrum. A Google search finds a lot of people seeing purple at night when driving, but no one seems to see any other colors. Why purple? It would make sense if it was UV. Perhaps it is easier to see at night when the pupils are large and the other color seeing eye cones are no longer able to function due to low light.
it helped the citizens of the world see while they where driving at night or during a storm or foggy day.
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See the related link below.
scanning, identifying, seeing
Most states allow holders of learner's permits to drive at night because it is necessary to the learning experience. Holders of occupational and other driving permits should check their restrictions to see if driving at night is permitted.
Within the distance you can see ahead
because you can't see them at night and plus when you are driving you don't want to hit them.
Wear sunglasses. You will still be able to see the road.
They have visors in their helmet which can help them to see out of
see CarTalk.com
i think white because of headlights
It's recommended that sunglasses be worn for driving so you can see clearer.