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Intersection Improvements

Enhancing traffic flow, safety, and efficiency

Enhancing connectivity at every intersection

Creating harmony between traffic flow, safety, and efficiency is crucial for drivers, cyclists, and pedestrians alike. This balance establishes an inclusive transportation network, promoting coexistence between different modes and creating a safer, more efficient roadway network. Our intersection expertise includes:

  • Traffic Signals 

  • Roundabouts

  • Channelization

  • Bicycle Facilities 

  • Roadway Grading

  • Intersection Grading 

  • ADA Pedestrian Facilities 

  • Signing  

  • Work Zone Traffic Control 

  • Cost Estimating 

  • Project Specifications 

Client Projects

A few of our recent favorites

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Dahlgren North Bend Way RAB.jpg

Covington Connector

City of Covington, WA

The team designed improvements for nearly two miles of a new 5-lane roadway. Intersection improvements include two multi-lane roundabouts, two new traffic signals, and two single-lane roundabouts at a ramp interchange. Enhancements feature decorative lighting, artistic elements in roundabout central islands, a shared-use wildlife and pedestrian trail undercrossing, and landscaping. 

Madigan Access Improvements

City of Lakewood, WA

Transpo led the traffic operation and safety analysis, concept development, and PS&E of the traffic signal system at the interchange along I-5, which provides primary access to the Madigan Army Hospital on Joint Base Lewis-McChord. Since construction was completed, the system has improved emergency access and dramatically reduced delay and queue lengths at intersections.  

Roundabout Design

City of North Bend, WA

Our team provided roundabout geometric design for a new roundabout to improve circulation at the intersection. Transpo also provided the work zone traffic control and signing/striping design for the project. This project highlights our ability to develop construction phasing that can be implemented with limited traffic impacts.  

Experts in our field

Some of the folks we are lucky to work with


“Transpo’s signal design expertise was crucial to the success of the project and obtaining consensus with partner agencies.”
-Weston Ott, City of Lakewood

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