In art schools if we talk about graffiti (Bansky for ewample) we use "street art" (or "graffiti" and "tag"), we don't translate it. Because if we use "Art de rue" we talk about all kind of arts which take place in the street like graffiti but also dance, theatre or performances.

"Street art" devient simplement "art de rue". Nous disons "Graffiti" ou "tag" (Un graffiti étant supposé plus "artistique" qu'un tag...)