The RTA plan includes $534 million in transit improvements over the 20-year plan. Improvements in all categories in the transit element are getting under way during the first phase of the plan, FY 2007-2011.

As of August 2009, 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

Sun Tran completed the new $3 million bus storage and maintenance facility in October 2009.

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.

Since the inception of the RTA plan, six new park-and-rides have been added to the transit system. Two other permanent park-and-ride sites, one in the city of Tucson and the other in the Town of Marana are currently in the planning stages and are anticipated to be completed near the end of the first period of the RTA plan.