Northwest 137th Avenue near Northwest 12th Street, opened June 22, 2007, was initially accessible only to motorists with SunPass electronic toll-paying capability; there is no capacity for the collection of cash. The road has since opened to non SunPass users with the Toll by Plate system. Until July 1, 2007, the toll for eastbound automobiles was $1.25 ($1.00 for motorists with SunPass), paid at a toll booth between Northwest 22nd and Northwest 17th Avenues (toll is not collected from westbound traffic). In conjunction with the completion of the new three-mile-long extension west of the Turnpike, tolls of $1.00 (75 cents for motorists with SunPass) were collected from traffic in both directions west of SR 973 (Northwest 87th Avenue/Galloway Road). Although the new toll was originally stated to be only for the extension, motorists going to the Florida Turnpike or Northwest 107th Avenue also have to pay. On July 21, 2013, the eastbound toll plaza near I-95 ceased cash collection and became all electronic, with those paying with SunPass paying $1, and Toll by Plate users paying $2. On November 15, 2014, the Dolphin Expressway became an all electronic toll road, no longer collecting cash, and the only ways to pay are either by the SunPass transponders or billing by the toll-by-plate program, at double the cost of SunPass users. Toll gantries are located along the expressway and on interchanges to where there are no "free movement" sections of the expressway as existed previously. The move was first announced in 2010, and along with the nearby Airport Expressway, was the last of the MDX expressways to be converted to open road tolling. On May 24, 2010, construction began on the Port Miami Tunnel, a $1 billion project that connects the port to other major highway arteries, including I-395, with the tunnel opening on August 3, 2014. Future Short range plans include the construction of additional lanes to match the rebuilt, higher capacity Dolphin-Palmetto Interchange, with SR 826. A planned third extension (southward to Southwest 136th Street) is currently being considered, though may have been replaced with the widening of the rural surface road Krome Avenue to four lanes. In 2021 the controversial extension, known as the Kendall Parkway, was still under consideration. The Dolphin Expressway is home to two of the state's three diverging-diamond interchanges after the reconstruction of two exits at Northwest 27th Avenue and Northwest 57th Avenue. Long-term plans