The RTA plan includes $534 million in transit improvements over the 20-year plan. The RTA is now in its sixth year of plan implementation.  

• Since inception of the RTA plan through to date, Sun Tran has added the following service improvements:
• Later weeknight service (Routes 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 15, 16, 17, 19, 21, 22, 23, 26, 27, 29, 34)
• Later weekend service (Routes 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 15, 16, 17, 19, 21, 22, 23, 26, 27, 29, 34)
• New weekend service (Routes 20 and 37)
• New express routes (Routes 104X, 107X, 110X, 203X)
• Additional trips on existing express services (Routes 103X, 105X)
• More frequent weekday bus service (Route 27)
• Route extension (Route 27 to Casino del Sol)
• 37 new biodiesel buses procured and placed into service
• Morning and afternoon routes added for Routes 101X and 109X
• Six new park-and-rides have been added to the transit system.

In January 2009, the RTA announced a rebranded look for Sun Tran to tie into all regional transit, including Sun Express, Sun Shuttle, Sun Rideshare, Sun Van and the Tucson Modern Streetar - Sun Link. The regional seamless concept also includes new fare payment technology that will introduce a "smart card" that people may use on Sun Tran, Sun Express, Sun Shuttle and the Sun Link Modern Streetcar.

In May 2009, the RTA introduced a new neighborhood transit circulator service in the communities of Marana, Oro Valley/Catalina and Green Valley/Sahuarita. The Sun Shuttle service has community routes with destination stops for medical, retail and recreational access and also connects with the Sun Tran fixed-route service. Sun Tran completed the new $32 million bus storage and maintenance facility in October 2009. The building is funded with funds from the RTA and Federal Transit Administration.