what we do


Designing connections that balance regional mobility and local access

From rural highway off-ramps to complex freeway interchanges, Parametrix helps agencies plan and design interchanges that safely and efficiently move traffic from one road to another. We help agencies with freeway and local operational analysis for highway and local corridors, and have provided analysis for numerous interchange justification reports (IJR), interchange modification reports (IMR) interchange access modifications, and corridor studies. Our staff have developed great working relationships with FHWA and state DOT staff and can guide you through the approval process.

I-84 Meridian Road Interchange;
Meridian, Idaho
Client: ITD

The I-84 Meridian Road Interchange project replaced an existing diamond interchange with a new Single-Point Urban Interchange (SPUI) and reconstructed over 4 miles of interstate to provide additional capacity, improve safety, and extend the design life of I-84. Considered the gateway to the City of Meridian, the interchange is currently the second busiest in the State of Idaho. Originally constructed in 1965, the interchange was designed to handle 11,000 vehicles per day. The new interchange is designed to handle 284,000 vehicles per day. The new two-span SPUI is wide enough to allow widening of the interstate to 4 lanes in each direction. Meridian Road now has 3 lanes in each direction with dual left turn lanes and sidewalks and bike lanes. Parametrix was the prime consultant for the design of this interchange, completing design and PS&E in just 10 months. Work was coordinated closely with an in-house ITD design team designing improvements to I-84, and we combined both projects into one bid package.

  • Engineering Excellence Award, ACEC, Idaho, 2017
  • Project of the Year over $10M,  ASCE Region 8, 2016
  • Project of the Year over $10M, ASCE Southern Idaho Section, 2016
  • 3rd Place - Transportation, Idaho Business Review, 2016


  • US 550, NM 313 to NM 528

    US 550, NM 313 to NM 528

  • SR 410/Traffic Avenue Interchange

    SR 410/Traffic Avenue Interchange

  • 116th Interchange at I-5

    I-5/116th Street NE Interchange

  • I-84 Karcher to Franklin | Parametrix

    I-84 Karcher to Franklin

  • I-5/Slater Road IJR | Parametrix

    I-5/Slater Road IJR

  • I-84 Meridian Road Interchange

    I-84 Meridian Road Interchange