The GRA or Grande Raccordo Anulare (literally, "Great Ring Junction" and not so literally as the "Great Ring Road") is a toll-free, ring-shaped orbital motorway, 68.2 kilometres (42.4 mi), in circumference that encircles Rome. Its acronym was given after one of its main designers and supporters, Eugenio Gra, chairman of ANAS, the Italian roads Authority, at the time of construction.
The official number among the Italian motorways is A90, but that ia barely known and not found anywhere on road signs. It is widely known by Romans as Il Raccordo ("The Junction"). The road was the subject of the 2013 documentary film Sacro GRA which won the Golden Lion at the 70th Venice International Film Festival - (From Wikipedia)