Happy Valley Road Traffic Interchange (TI)

Scope of Work

  • Removing the existing roundabouts and constructing a Diverging Diamond traffic interchange
  • Constructing a new overpass that would accommodate potential future expansion of I-17
  • Reconstructing Happy Valley Road to have:
    • Three through lanes in each direction
    • Dedicated left-turn lanes
    • Dedicated right-turn lanes
    • Bicycle lanes and pedestrian walkways
  • Constructing two exit lanes from northbound I-17 to Happy Valley Road
  • Re-grading the detention basins
  • Installing ramp meters, signals, lighting and pavement markers

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    Interchange Traffic Flow Movements

    DDI at I-17 and Happy Valley Road


    I-17/Happy Valley Interchange Traffic Movements

    I-17-Happy Valley Interchange Pedestrian and Bicycle Movements


    Before and After

    Compare the before (gray map) with the improvements map using the slider below: