Research Documents the Negative Externalities of 20th Century Freeway Planning

According to a newly released working paper, people in 20th century noticed the air and noise pollution and severed neighborhoods caused by freeways, and many of those people chose to move to the suburbs rather than deal with the nuisance.

1 minute read

July 12, 2019, 7:00 AM PDT

By James Brasuell @CasualBrasuell


Chicago Freeway Traffic

Ken Lund / Flickr

The Federal Reserve Bank of Philadelphia released a working paper [pdf] recently that documents the detrimental effects of freeways on quality of life in central urban areas.

As explained in an article by Darryl C. Murphy, researchers at the Federal Reserve Bank of Philadelphia "took a broad look at how highways have contributed to suburbanization, and the subsequent decline of U.S. cities during the 20th century. "

"They found that between 1950 and 2010 highways slowed growth in income, population, and land values in city centers, while having the opposite effect in outlying areas," according to Murphy.

A key aspect of the narrative built in the paper is the history of "freeway revolts"—communities banding together to sway the final product of the Interstate highway system where it passed through urban areas. The study documents the changes these revolts were able to produce in the final freeway products of urban areas.

Despite the location of the authors who wrote this working paper, the research focuses specifically on examples from Boston, Chicago, and Detroit.

Tuesday, July 9, 2019 in PlanPhilly

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 11, 2025 - Diana Ionescu

Rendering of Shirley Chisholm Village four-story housing development with person biking in front.

San Francisco's School District Spent $105M To Build Affordable Housing for Teachers — And That's Just the Beginning

SFUSD joins a growing list of school districts using their land holdings to address housing affordability challenges faced by their own employees.

June 8, 2025 - Fast Company

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.

June 6, 2025 - PC Magazine

White Waymo autonomous car driving fast down city street with blurred background at night.

Seattle's Plan for Adopting Driverless Cars

Equity, safety, accessibility and affordability are front of mind as the city prepares for robotaxis and other autonomous vehicles.

3 hours ago - Smart Cities Dive

Two small wooden one-story homes in Florida with floodwaters at their doors.

As Trump Phases Out FEMA, Is It Time to Flee the Floodplains?

With less federal funding available for disaster relief efforts, the need to relocate at-risk communities is more urgent than ever.

4 hours ago - Governing

People riding bicycles on separated bike trail.

With Protected Lanes, 460% More People Commute by Bike

For those needing more ammo, more data proving what we already knew is here.

7 hours ago - UNM News