I'm not a Roman so my directions stick to the main route: take the motorway to Leonardo da Vinci (Fiumicino) airport and, before getting there, you'll meet the juction to A12 motorway going north to Civitavecchia. It should take you the best par of an hour to get there, but beware of peak times. Coming back from Civitavecchia, just follow the A12 south but this time turn towards the airport and ther you'll find the signs leading to Ostia and Ostia antica. BTW I visited the excavations many years ago and enjoyed the place, except for the low-flying aircrafts departing from Fiumicino. Bye

Paolo Trieste, Italy