Rome - CIS or CIRS????
 

We will be in Rome in about 3 weeks and will be staying just out of the city in Prima Porta.
We need to take a train from Flaminio metro station to the Prima Porta stop and then a bus from there.
I would like to purchase a weekly metrebus ticket but am unsure if we need to get the CIS or the CIRS as I don't know under what category the train to Prima Porta will fall under.
Hoping to buy the correct pass as soon as we get there....with your help!!

thanks very much..

You should be able to use the CIS since it covers the Rome/Viterbo line and Prima Porta is a stop on that line.
http://www.atac.roma.it/index.asp?p=...&NUM=FU03A

thank you kybourbon