You have to cover the Florence-Siena highway, then exit in Siena Sud and take the S.S.2 Cassia - Rome.
After Buonconvento, you meet the cross for Montalcino.
You can choose between the Cassia (Bolsena-Viterbo-Acquapendente) and the A1 Motorway towards Florence (Chiusi-Chianciano Terme exit). In Chiusi, follow the signs for Montepulciano, Pienza and then San Quirico d'Orcia, where you take the Cassia, direction Siena. After 5 minutes you meet the exit for Montalcino.
You have to cover the highway for Siena and then exit in Paganico, where you follow the signs for Montalcino.
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