Interstate 11 is part of a long-range vision for the Valley's future transportation needs, as defined by the Maricopa Association of Governments and ADOT. Interstate 11 was approved June 30, 2012 as part of the Moving Ahead for Progress in the 21st Century Act. In June 2013, a joint draft study commissioned by the respective DOTs of Arizona and Nevada concluded that the freeway was justified, citing benefits in travel, tourism, trade, and economic growth. The conclusion of the study further clears the way for Interstate 11's funding and implementation. The Tres Rios Freeway, has been proposed as an east–west freeway in an effort to move some West Valley motorists off of I-10 in an attempt to decrease traffic along that frequently congested Interstate. Its western beginning would be at Route 85, and it would run east to encounter proposed Loop 303, and continue through to Loop 202's South Mountain Freeway. From there it would continue east to a terminatus at Interstate 17 near downtown Phoenix at the Durango Curve. Construction of the proposed Route 30 (former SR 801) has been approved, and will begin sometime in the early 2020s based on funding and planning by the Maricopa Association of Governments. Following the approval of Interstate 11 in the 2012 Surface Transportation Act, a study for a Westward extension of SR 30 to I-11 will be conducted by MAG. Due to expected rapid growth in the northwestern reaches of the metropolitan area, long-term regional highway plans include acquisition of right-of-way for eventual future expansion of SR 74 to a controlled-access freeway. ADOT is currently in the study phase of identifying a corridor for the planned Pinal North-South Freeway to serve expected growth in the Pinal County region of the Phoenix Metro area. This future freeway would connect I-10 around Eloy with the Superstition Freeway (US 60) in Apache Junction, passing through Coolidge and Florence and intersecting with planned future alignments of the Hassayampa Freeway (I-11) and the Williams Gateway Freeway (SR 24). The White Tank Freeway is a new long-term freeway alignment designed to address expected rapid growth in the far northwest valley around Surprise and northern Buckeye. The freeway will begin at the US 60 interchange with Loop 303 in Surprise, run concurrent with US 60 for several miles, then split off westward to connect with the planned future alignment of the Hassayampa Freeway (Interstate 11) west of Buckeye. The table below lists commonly used colloquialisms and nicknames for several interchanges and portions within the freeway system.