SR 167 Corridor Improvements Project, WA
Image Credit: Atkinson Construction
AAR Testing and Inspection, a SOCOTEC Company, provided construction materials testing, special inspections, field quality assurance, and electrical system inspection support for the SR 167 Corridor Improvements Project, helping support the modernization of Washington State's express toll lane infrastructure.
Key Information
Project Name: SR 167 Corridor Improvements Project
Client: Northup/Harbor Pacific
Owner: Washington State Department of Transportation (WSDOT)
Location: Pierce and King Counties, WA
Project Value: $102 Million
Services Provided: Construction Materials Testing, Special Inspections and QA/QC Oversight
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The Challenge
Modernizing Washington's Express Toll Lane Corridor
The SR 167 Corridor Improvements Project supports the modernization of the Washington State Department of Transportation's (WSDOT) express toll lane system by replacing aging tolling infrastructure with updated electronic tolling technology.
The project aligns the SR 167 toll system with the I-405 Express Toll Lane network, creating a continuous 50-mile express toll corridor extending from SR 512 in Puyallup to the I-405/I-5 interchange in Lynnwood. The improvements are designed to provide a more consistent tolling experience while improving highway operations and travel reliability.
The project included:
- Installation of 64 drilled shaft foundations supporting 37 sign structures, including 27 sign bridges and 10 cantilevers.
- Installation of 294 permanent signs, including new electronic toll rate and travel signs.
- Resurfacing of the southbound Green River Bridge.
- Lane reconfiguration to expand roadway capacity.
Delivering these improvements required construction activities within an active highway environment while maintaining toll operations and minimizing impacts to ongoing transportation activities.
Additional project challenges included:
- Nighttime and staged traffic control required to limit lane closures while maintaining corridor mobility.
- Strict interface requirements between roadway work, electrical systems, and WSDOT’s regional tolling network.
- Limited workspace constraints near median barriers, shoulders, and access areas.
- Coordination with multiple stakeholders, including WSDOT’s Toll Division, electrical subcontractors, and ITS vendors.
The SOLUTION
Construction Materials Testing, Special Inspections, and Quality Assurance
AAR Testing and Inspection, a SOCOTEC Company, supported the project by providing construction materials testing, special inspections, field quality assurance, and electrical system inspection services throughout construction.
Working closely with the contractor and WSDOT technical teams, our team helped verify that tolling equipment foundations, electrical installations, communications infrastructure, and structural components met project specifications while construction progressed within an active highway corridor.
Services Provided
The Results
Supporting Reliable Transportation Infrastructure
The SR 167 Corridor Improvements Project modernized critical tolling infrastructure while supporting a more seamless travel experience across Washington's regional express toll lane network.
Through comprehensive construction materials testing, special inspections, field quality assurance, and electrical inspection support, AAR Testing & Inspection, a SOCOTEC Company, helped support the successful installation of tolling infrastructure within an active highway environment.
The project demonstrates our ability to deliver multidisciplinary inspection and quality assurance services for complex transportation infrastructure projects involving roadway improvements, electrical systems, and intelligent transportation technologies.
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