When in the Auvergne Rhone-Alpes region of France recently I noticed a lot of roadside signs depicting a black sillouette of a man with a red part indicating a broken heart or a brain injury ("attack"?). Sometimes these were in groups of 2 or 3. What do these mean? I thought perhaps to indicate where there had been previous road accidents, as a deterant, but there appeared to be a lot of them. Also, why sometimes a brain attack symbol, and othertimes a heart attack symbol? They mostly seemed to appear on the outskirts of small towns.