 The A6 also passes the Colle di Cadibona at 435m, a watershed between the Ligurian Apennines and the Po Valley in 14 km with an uninterrupted route of tunnels and viaducts and, exclusive to Italy, a helical curve in the south roadway.The A6 is also connected to the new Autostrada A33 Asti – Cuneo.The Asti East tollgate of the A21 Torino – Piacenza – Brescia will take you through Alba to the tollgate of the A6.