Interesting work from VINCI.

VINCI is testing the "the effectiveness of a lightcoloured road surface as regards improving visibility and limiting energy consumption, notably by reducing the need for lighting" in a Greek tunnel.

The article says the method already been tested in Germany and France and found to be effective.

https://www.vinci.com/vinci.nsf/en/news-update/pages/pilot_project_to_test_road_surface_in_a_tunnel_greece_112022.htm