Coming from the highway Torino-Savona:
exit at Carrù, turn right and go on in direction Clavesana; once you see the sign of Clavesana, cross the bridge, turn left, go past the houses of the village and the Cantina di Clavesana, then turn right in direction Ghigliani. After the new bridge on the river Tanaro, turn left and go straight on for about 2,5 km, until you reach the small hamlet San Martino: you have arrived.