It isn't a spider, because it only has six legs. And what are the three phallic symbols in the middle all about?
And I thought the red "D" with the swirl might be the logo for Dax, but it doesn't seem to be.
Then round the other side of the roundabout there are about a dozen painted posts.
Then round the other side of the roundabout there are about a dozen painted posts.
All to be found on the ring road as you approach Dax from Mont de Marsan in the Landes.