Yellow headlights used to be a legal requirement for driving in France and we had to put yellow film on when driving there until the EU standardized white headl

Yellow headlights used to be a legal requirement for driving in France and we had to put yellow film on when driving there until the EU standardized white headlights. Apparently it was to reduce dazzle and glare: https://en.wikipedia.org/wiki/Selective_yellow https://en.wikipedia.org/wiki/Selective_yellow