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

    I-84 Meridian Road Interchange

  • I 5/116th St NE | Parametrix

    I-5/116th Street NE Interchange

  • West Olympia Access Study and IJR | Parametrix

    West Olympia Access Study and IJR

  • I-5/Slater Road IJR | Parametrix

    I-5/Slater Road IJR

  • SR 520 Bridge Replacement and HOV Program | Parametrix

    SR 520 Bridge Replacement and HOV Program

  • I-84 Karcher Interchange | Parametrix

    I-84 Karcher Interchange