 It was built in 1972 as a spur from the existing Hochsölden road.The road climbs the Rettenbach valley from Solden in the Ötztal valley in Tyrol.Near the top of the valley, the foot of the Rettenbach glacier, the road turns south and continues climbing through a ski tunnel—the second highest road tunnel in Europe—where the highest point of the road is at the southern end of the tunnel.