ACCESS ROADS

From Rome:
Autostrada (Motorway) A1 - Exit: Frosinone
Go through SS 156 until Priverno.
Take Strada Marittima towards Priverno - Terracina.
500 metres after Fossanova Abbey,  take the crossroad to Sonnino.

From Naples:
Motorway A1 - Exit: Frosinone
see above.