I'm kind of surprised this hasn't occurred to a wily old diplomat like Emmanuel Macron. The simplest way to end the "yellow vest" protests is to change the law that requires motorists to always have yellow safety vests in their cars and instead make the new requirement require "black vests". Play around in one of those by the side of the road at night and pretty soon the crazy drivers will take care of the problem. Alternatively, the law should say that the safety vests must be of approved night camouflage.
No, don't worry Macron, you can send me a check later for this brilliant idea. I have plenty more.