Study: Wider Highways Won't Reduce Congestion

Widening highways won't reduce congestion—that's the conclusion of a report paid for by the state agency proposing several highway widening projects in Oregon.

1 minute read

March 13, 2018, 7:00 AM PDT

By James Brasuell @CasualBrasuell


Willamette River

Josemaria Toscano / Shutterstock

A new report (pdf) by Montreal-based engineering firm WSP has bad news for anyone who advocates for highway widening as a cure for congestion.

Dirk VanderHart shares news of the report by WSP, which was under contract with the Oregon Department of Transportation (ODOT) to analyze the effects of proposed highway widening projects in the Portland area. According to the report, "none of the dozen highway-widening projects that are currently being planned in and around Portland by state officials would be enough in coming years to stem the increasing congestion choking Portland highways."

VanderHart notes that is a surprising finding for a report commissioned by the Oregon Department of Transportation—"a relentless champion of highway-widening projects." In fact, it sounds a lot more like the talking points of the vocal opposition to the plan to widen I-5 in the Rose Quarter of Portland.

Wednesday, March 7, 2018 in The Portland Mercury

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Cover CM Credits, Earn Certificates, Push Your Career Forward

Logo for Planetizen Federal Action Tracker with black and white image of U.S. Capitol with water ripple overlay.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

June 4, 2025 - Diana Ionescu

Metrorail train pulling into newly opened subterranean station in Washington, D.C. with crowd on platform taking photos.

Congressman Proposes Bill to Rename DC Metro “Trump Train”

The Make Autorail Great Again Act would withhold federal funding to the system until the Washington Metropolitan Area Transit Authority (WMATA), rebrands as the Washington Metropolitan Authority for Greater Access (WMAGA).

June 2, 2025 - The Hill

White and yellow DART light rail train in Dallas, Texas with brick building in background.

DARTSpace Platform Streamlines Dallas TOD Application Process

The Dallas transit agency hopes a shorter permitting timeline will boost transit-oriented development around rail stations.

May 28, 2025 - Mass Transit

Aerial view of large complex of apartment buildings surrounded by fall foliage trees in suburban Dallas, Texas.

Renters Now Outnumber Homeowners in Over 200 US Suburbs

High housing costs in city centers and the new-found flexibility offered by remote work are pushing more renters to suburban areas.

2 hours ago - Point2

Yellow single-seat Japanese electric vehicle drivign down road.

The Tiny, Adorable $7,000 Car Turning Japan Onto EVs

The single seat Mibot charges from a regular plug as quickly as an iPad, and is about half the price of an average EV.

4 hours ago - PC Magazine

Worker in hard hat stands in front of oil pipeline under construction with yellow heavy equipment.

Supreme Court Ruling in Pipeline Case Guts Federal Environmental Law

The decision limits the scope of a federal law that mandates extensive environmental impact reviews of energy, infrastructure, and transportation projects.

June 5 - NPR

Urban Design for Planners 1: Software Tools

This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.

Planning for Universal Design

Learn the tools for implementing Universal Design in planning regulations.