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The Miami-Dade Expressway Authority (MDX) is an independent agency created in December 1994 by the State of Florida and the Miami-Dade County Commission. Since 1997 MDX has operated and maintained five expressways formerly operated by the Florida Department of Transportation (FDOT): * Gratigny Parkway (SR 924) * Airport Expressway (SR 112) * Dolphin Expressway (SR 836) * Don Shula Expressway (SR 874) * Snapper Creek Expressway (SR 878) All five expressways are all electronic toll roads, requiring the use of SunPass or a "toll-by-plate" program and do not accept cash, and the free movement sections were removed. The Gratigny Parkway, Don Shula Expressway, and Snapper Creek Expressway became all electronic in 2010, while the Airport Expressway and Dolphin Expressway were converted 2014.〔Garvin, Glenn. ("Miami-Dade’s 836, 112 expressways to close at night to install toll equipment" ). ''Miami Herald'' 25 July 2014. Retrieved 20 August 2014〕 Completely funded by toll revenues, MDX has been aggressively upgrading and updating its roads over the past decade, including the ongoing Dolphin Expressway extension (the first phase was completed in 2007) and re-engineering of several interchanges of its two oldest expressways (the Airport and Dolphin). Long-term plans include the redesign and reconstruction of longtime bottlenecks in the Shula and Dolphin Expressways, most notably the often-backed-up Killian Parkway/SR 990 interchange near Miami Dade College-Kendall Campus and the heavily congested interchange with the Palmetto Expressway (SR 826) near the extreme southwestern end of Miami International Airport. == Markings == All MDX highways use the shield-shaped signs reserved by FDOT for toll roads, with the MDX logo (see above) attached below the "shield". In addition, all MDX highways use a uniquely designed mileage marker. Instead of the green "MILE XX" markers commonly seen on interstate highways, the five MDX expressways use blue mileage markers featuring (from top to bottom, in white): a single letter indicating the direction of travel, the State Road designation of the highway (complete with outline of the State of Florida), and two numbers separated by a horizontal line ("2" on the top, "4" on the bottom of the line represents Mile Marker 2.4 from either the southern or western end of the expressway). These markers are placed on the edge of the shoulder every 0.2 miles along the expressway. The Gratigny Expressway has two of these (Mile Markers 5.0 and 5.2) on a surface street near Opa-locka on Northwest 119th Street just east of the end of its easternmost ramp). Prior to the removal of free movement sections, on portions of a MDX route where no tolls are ahead, the TOLL in the green section of the TOLL shield was removed. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Miami-Dade Expressway Authority」の詳細全文を読む スポンサード リンク
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