Smart roads that change color when temperatures drop
Cold weather often leads to poor visibility, making driving dangerous. Colour-changing roads can warn drivers of unsafe road conditions and help improve visibility.
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Some cars also have an “icy warning” light to alert drivers of hazardous road conditions.
You could mark the roads with glowing paint, improving visibility in dark conditions.
Someone had this concept a while back – roads that turn pink in icy conditions!
https://www.newscientist.com/article/dn13592-intelligent-paint-turns-roads-pink-in-icy-conditions/