what we do

Roadway & Highway Design

Designing infrastructure to safely and efficiently move people and goods

Providing safe and efficient transportation infrastructure is more challenging today due to limited funding and increasingly complex regulatory processes. Parametrix works with clients to develop solutions that are cost effective and minimize disruption to users and the environment. We incorporate LID, green streets, and complete streets principles to create appealing, safe, and sustainable transportation right-of-ways.

I 5/116th St NE Interchange | Parametrix
​I-5/116th Street NE Interchange 
​Tulalip, Washington
Client: ​​​​Tulalip Tribes

This project replaces an existing diamond interchange with a single-point urban interchange to reduce congestion and improve mobility. The area has experienced significant development and congestion, leading to back-ups onto the interstate highway creating unsafe conditions. Parametrix led the design, which has involved widening all ramps; providing HOV bypass lanes; constructing a new wider bridge carrying more thru and turn lanes, bike lanes, and sidewalks across I-5; managing stormwater; and improving local roads.



  • I-84 Meridian Road Interchange | Parametrix

    I-84 Meridian Road Interchange

  • Cross-SKIA Connector | Parametrix

    Cross-SKIA Connector

  • Idaho 16, US 20/26 | Parametrix

    Idaho 16, US 20/26 to Idaho 44

  • I 5/116th St NE Interchange | Parametrix

    I-5/116th Street NE Interchange

  • Port Westward Roadway | Parametrix

    Port Westward Roadway Improvements

  • Shaw Road Extension | Parametrix

    Shaw Road Extension