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)
Three of the 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 are electronic, while the Airport Expressway and Dolphin Expressway will be converted by 2013.
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 western end of Miami International Airport.
Read more about Miami-Dade Expressway Authority: Markings, Airport Expressway, Dolphin Expressway, Don Shula Expressway, Snapper Creek Expressway, Gratigny Parkway
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