The Miami-Dade Expressway Authority is the agency responsible for the five intra-county expressways. It was created to ensure that toll money collected from these roads stays within Dade County, rather than being pooled with the larger pot of FDOT money. From the MDX website:

MDX is a state sanctioned, locally administered, public agency created in 1994 by the State of Florida and the Board of County Commissioners of Miami-Dade County. MDX is governed by its Board, comprised of 13 volunteer members appointed by the Board of County Commissioners and the Governor of the State of Florida. MDX oversees, operates and maintains five expressways: SR 836/Dolphin Expressway; SR 112/Airport Expressway; SR 874/Don Shula Expressway; SR 878/Snapper Creek Expressway; and SR 924/Gratigny Parkway.

This was one of the FAQ’s that caught my eye:

SR 836 seems the same despite the MDX improvements. Why?
Projects to address the main congestion points on SR 836, between LeJeune Road and the Palmetto (SR 826), are in final design and will be constructed over the next several years. While there will never be sufficient capacity to fully handle all expected growth in demand, construction of the planned project will significantly help lessen time delays, and make travel more consistent over the length of MDX facilities.

This is a pretty obvious acknowledgment that we cannot build our way out of congestion (on the 836 or any other highway). MDX operates with a five year work program of approximately $500 million dollars.

Future Projects (not yet included in five year program):

Many observers have noted that the way MDX finances and operates its ‘business’ is a great model for our transit agency, with some going so far as to suggest that MDX takes over transit responsibilities for MDT. Currently, MDX Dirtector Javier Rodriguez is studying how MDX can play a more active role in promoting a modal shift in Dade County. We look forward to his ideas.

If you have any questions or comments for MDX please contact:
publiccomm@mdxway.com

Miami-Dade Expressway Authority
3790 NW 21st Street
Miami, FL 33142
Telephone: (305) 637-3277
Fax: (305) 637-3283

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