From highway A1 or A24, take the GRA A90 ring (Grande Raccordo Anulare) in the direction of SALARIA. Take the exit n. 8 SALARIA towards ROMA CENTRO SALARIO PARIOLI and continue along on Via Salaria for about 9 kilometres / 6 miles, until you pass the park of Villa Ada. Turn left on Via di Villa Ada and at the roundabout (Piazza Verbano), take the second exit towards Via Topino. Turn second right (Via Avignana) then turn first right and continue along for about 400 meters / 0,25 miles (straight on Via Fucino => Via Reno => Via Serchio) till reaching Via Ombrone n. 12 (access from the green gate).
Road-side parking spaces info: metered parking from mon to sat, from 8am to 7pm in areas marked by blue lines; free parking in areas marked by white lines (at any time) and from mon to sat from 7pm to 8am on working days and on Sunday or public holidays in areas marked by blue lines.
Daily, weekly and monthly pass available, for info and fees: http://www.atac.roma.it/page.asp?p=23&i=15