Given the following context:

Providence is served by T. F. Green Airport in Warwick, and general aviation fields also serve the region. Massport has been promoting T. F. Green as an alternative to Boston's Logan International Airport because of over-crowding.Providence Station is located between the Rhode Island State House and the downtown district and is served by Amtrak and MBTA Commuter Rail services, with a commuter rail route running north to Boston and south to T.F. Green Airport and Wickford Junction. Approximately 2,400 passengers pass through the station per day.I-95 runs from north to south through Providence; I-195 connects the city to eastern Rhode Island and southeastern Massachusetts, including New Bedford, Massachusetts and Cape Cod. I-295 encircles Providence, while RI 146 provides a direct connection with Worcester, Massachusetts. The city commissioned and began the long-term project Iway in 2007 to move I-195 for safety reasons, to free up land, and to reunify the Jewelry District with Downcity Providence, which had been split from one another by the highway. The project was estimated to cost $610 million.
Kennedy Plaza in downtown Providence serves as a transportation hub for local public transit as well as a departure point for Peter Pan Bus Lines and Greyhound Lines. Public transit is managed by Rhode Island Public Transit Authority (RIPTA). Through RIPTA alone, Kennedy Plaza serves more than 71,000 people a day. The majority of the area covered by RIPTA is served by traditional buses. Of particular note is the East Side Trolley Tunnel running under College Hill, the use of which is reserved for RIPTA buses. RIPTA also operates the Providence LINK, a system of tourist trolleys in downtown Providence. From 2000 to 2008, RIPTA operated a seasonal ferry to Newport, Rhode Island between May and October, but SeaStreak began operating that ferry route in 2016.

answer the following question:

What is the full name of the authority that uses the East Point Trolley Tunnel for their buses? 

Rhode Island Public Transit Authority