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In page SolaRoad:

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The road surface consisted of prefabricated panels with a surface of 1 centimetre (0.39 in) thick hardened glass. Beneath the glass solar cells were installed. TNO stated that this energy can be used for lighting of the road, traffic lights and road signs. The energy was also delivered to local dwellings. TNO thought that in the future, electrical vehicles might be driven by the road itself.[1] This prototype was studied over the next three years.[citation needed]