 After four kilometres SS4 meets Tangenziale Est di Roma and, from that point on, becomes a busy dual carriageway urban road, filled by people leaving or entering the city.In the Castel Giubileo neighborhood, SS4 exits the city of Rome and meets Grande Raccordo Anulare (GRA), where most of the traffic flows.Immediately after, the road returns a single carriageway highway; in fact the subsequent 20 kilometer stretch, from the GRA to Passo Corese, has seen his importance reduced since the 6-lane Autostrada A1 runs parallel to it and absorbs most of the long-distance traffic.