The RPTA was formed in 1985 as the result of Phoenix-area voters approving a one-half percent sales tax increase for expansion of the local freeway system, and for expansion of mass transit. The RPTA was then chartered under the laws of the state of Arizona. At the time, almost all transit service in the Phoenix area was operated by Phoenix Transit System, with a few other bus services such as in Mesa (Mesa Sunrunner) and Scottsdale (Scottsdale Connection) having started around 1990. Valley Metro, as an integrated regional transit service, did not begin operations under its own brand identity until 1993, when the RPTA board of directors chose that name, the logo, and color scheme as described below. At this time, Phoenix Transit System and Mesa Sunrunner were rebranded as Valley Metro, and several new routes operating under the RPTA were started.