McMillan and Black Cat Roundabout

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The Ada County Highway District (ACHD) is designing a future roundabout for the McMillan and Black Cat intersection. The purpose of the project is to improve traffic flow and increase safety for all users.

Proposed Improvements

  • Construct a multi-lane roundabout at the McMillan and Black Cat intersection
  • Add curb, gutter and a detached 10-foot-wide multi-use pathway
  • Construct crosswalks at each leg of the intersection with two-stage pedestrian crossings
  • Install rectangular rapid flashing beacons (RRFBs) at each pedestrian crossing
  • Add a truck apron for larger vehicles to use if necessary and intersection lighting


The Ada County Highway District (ACHD) is designing a future roundabout for the McMillan and Black Cat intersection. The purpose of the project is to improve traffic flow and increase safety for all users.

Proposed Improvements

  • Construct a multi-lane roundabout at the McMillan and Black Cat intersection
  • Add curb, gutter and a detached 10-foot-wide multi-use pathway
  • Construct crosswalks at each leg of the intersection with two-stage pedestrian crossings
  • Install rectangular rapid flashing beacons (RRFBs) at each pedestrian crossing
  • Add a truck apron for larger vehicles to use if necessary and intersection lighting


  • Check out the design!

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    Please review the information below to learn more about the project and provide comments. While your comments are always welcome, the comment period closed on July 26, 2023

Page last updated: 27 Jul 2023, 01:49 PM