The Arizona Department of Transportation, in cooperation with MAG, has initiated a study to evaluate potential capacity improvements at the Interstate 17 and Indian School Road traffic interchange in Phoenix. The interchange was identified as a candidate for capacity improvements in the Maricopa Association of Government (MAG) Interstate 10/Interstate 17 Corridor Master Plan (also known as the Spine Study), which was finalized by MAG in 2017. The latest information about the Spine Study is available on MAG’s website, keyword “Spine Study.” Funding for design, right-of-way acquisition, utility relocations and construction of the interchange project is included in fiscal year 2020 of ADOT’s current Five-Year Transportation Facilities Construction Program.
The major reason this project is needed:
Traffic congestion levels will continue to increase and are expected to reach unacceptable levels by the Year 2040.
ADOT is studying the no-build and two build alternatives as described below:
- No-build option: No action is taken and the intersection remains in its current state.
- Three-Level (or Platform) Diamond Interchange: Would create a third (top) level to accommodate two undisturbed through lanes for eastbound and westbound traffic on Indian School Road across the interchange. I-17 ramp intersections and turning traffic would occupy the middle (ground) level, and the lowest level would remain as I-17.
- Other Viable Alternative: To be determined