Not sure if this has been thought of before but it's the first I've heard of it.
Quote:
Glow in the dark road markings have been unveiled on a 500m stretch of highway in the Netherlands.
The paint contains a "photo-luminising" powder that charges up in the daytime and slowly releases a green glow at night, doing away with the need for streetlights.
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http://www.bbc.co.uk/news/technology-27021291