That's a pretty stiff curb........something like 8 inches? (its well over double, if not triple most sidewalk curbs). Most cars will not take well to attempting to mount that.
I don't think it would be worthwhile to mount industrial grade guard rails or jersey barriers all along the route, a side to side climb by accident isn't quite impossible but beyond unlikely.
That said, where, as in this case, an intersection faces the ROW, I think there's a case to be made for a 15M stretch of guard rail. {there shouldn't be, but the evidence is what it is)