broad transition zone between a humid subtropical climate (Cfa), which dominates Central Florida, and within the northern extent of the tropical climate typical of South Florida. Summers are usually hot, with high temperatures averaging in the low 90s. Winters are usually mild to warm, with average high temperatures in the 70s. The average yearly precipitation is around 53.5 in. In 2004 and 2005, Port St. Lucie was hit directly by three hurricanes: Frances (Category 2), Jeanne (Category 3), and Wilma (Category 3). Infrastructure Transportation Port St. Lucie is served by the St. Lucie Transportation Planning Organization (TPO). The TPO is a Metropolitan Planning Organization (MPO), a federally mandated and federally funded transportation policy-making organization responsible for transportation planning, programming, and financing of State and Federal Transportation Funds for the City of Port St. Lucie. The TPO is governed by a TPO Board, which is composed of elected officials, representatives from the St. Lucie County School Board, and representatives from Community Transit, a division of The Council on Aging of St. Lucie, Inc. Air Vero Beach Regional Airport (located about 25 miles north of Port St. Lucie) offers regularly scheduled passenger service on Breeze Airways. Palm Beach International Airport is located approximately 40 miles to the south. Bus The original bus system started out as a demand response service bus in the 1990s, it only served St. Lucie County. Soon it expanded to a fixed route system, going to predetermined locations along a route. On June 3, 2002, the Florida Department of Transportation (FDOT) approved funding, expanding the bus service to Martin County, and became the Treasure Coast Connector. Expressways Florida's Turnpike (State Road 91) is the only toll road in St. Lucie County, which is the northernmost place where the Turnpike and Interstate 95 run close to each other. The Turnpike has 2 exits within Port St. Lucie's city limits: Exit 142 (Port St. Lucie Boulevard (SR 716)) and exit 138 (Becker Road). For all of its route through Port St. Lucie, the Turnpike is east of I-95. The Turnpike is 4 lanes wide (2 in each direction), and provides access to Orlando to the north, and Miami to the southeast. The Port St. Lucie/Ft. Pierce Service Plaza is also located in Port St. Lucie. Interstate 95 (State Road 9) is in the western portion of the city. It is 6 lanes wide (3 in each direction), and provides access