No, it was only France, where they were mandatory. In other EU countries they were however allowed up to a certain date (in Italy they are accepted only for ve

No, it was only France, where they were mandatory. In other EU countries they were however allowed up to a certain date (in Italy they are accepted only for vehicles built before 1993, and in the same date France made them not mandatory). The yellow is not "a" yellow it is a very specific one, called "Selective Yellow": https://en.wikipedia.org/wiki/Selective_yellow https://en.wikipedia.org/wiki/Selective_yellow