Induced Demand

Bay Bridge Toll Traffic

Telecommuting Trend Not Decreasing Traffic

Commuting statistics have held consistent, according to Census data, even as the number of people working from home continues to climb.

November 10, 2017 - Governing

Maryland's $9 Billion Project Would Be the Nation's Largest P3 for Highways

Gov. Larry Hogan (R-Md.) announced last week plans for the largest highway contract awarded to a public-private partnership: adding four express toll lanes to the Capital Beltway and I-270. A third highway widening will be completed internally.

September 29, 2017 - Planetizen

Red Light Camera

Ann Arbor's Futuristic Traffic Software

The networked sensors and signals in Ann Arbor give the city a coordinated way to respond to traffic.

March 13, 2017 - Wired

405 Traffic

Benefits Harder to Recognize as Costs to Widen the I-405 Rise

Was the I-405 widening project worth it for Los Angeles? Depends on whom you ask.

December 22, 2016 - Los Angeles Times

Seattle

Against Seattle's Waterfront Highway

Seattle is set to build a nine-lane tunnel on its waterfront, the Urbanist's Ryan Packer is disappointed with its design and the project's stated goals.

November 10, 2016 - The Urbanist

London

London Bridges Going Up

London Mayor, Sidiq Kahn, authorizes two new bridges and a tunnel in eastern part of the city.

October 13, 2016 - City Lab

I-5 Widening

Critiquing the $1.9 Billion Project to Widen I-5 in Los Angeles County

Streetsblog slams Caltrans for wasting $1.9 billion on futile freeway widening projects.

September 29, 2016 - LA.Streetsblog

Expo Line

What L.A.'s New Expo Line Extension Won't Do

The $1.5 billion, 6.6-mile light rail extension from Culver City to Santa Monica is projected to double trips on the line by 2030, giving commuters a viable alternative to driving. Just the same, don't expect the extension to reduce congestion.

May 23, 2016 - Wired

Texas Highway Opens Shoulders to Drivers—Congestion Disappears

An experiment in Irving on SH 161 is defying the rules of induced demand, but not by building new lanes.

April 18, 2016 - The Dallas Morning News

Trinity Parkway Would Raise Dallas-Area VMT by One Million Miles a Day

Pitched as a necessary addition to reduce congestion on interstates 30 and 35E as they pass Downtown Dallas, the Trinity Parkway is likely to induce one million additional vehicle miles traveled a day.

January 25, 2016 - The Dallas Morning News

Connecticut Gov. Malloy Picks Sides in the Highway Widening Debate

Connecticut Governor Dan Malloy sees potential benefits in economic development and congestion reduction in a pair of highway widening proposals in his state.

October 10, 2015 - WNPR

Congestion as an Economic—Not an Engineering—Problem

Thinking about congestion as an economic problem generates new solutions for the problem as well as a response to accusations of social engineering.

September 29, 2015 - Urban Kchoze

Bay Bridge Toll Traffic

When a Freeway Goes Bad

At some point, in places all over the country, freeways stopped working as they were intended. What can be done to improve one of the great frustrations of life with a car?

August 23, 2015 - Pacific Standard

Katy Freeway

Too Big for Texas? Houston's 23-Lane Freeway

After a $2.3 billion widening project, traffic once again chokes the Katy Freeway's 23 lanes. For road spending critics who are also taxpayers, this I-told-you-so moment is bittersweet.

June 5, 2015 - Streetsblog Network

Does Peak Car Mean the End of Induced Demand?

Aaron Renn provides a dissenting argument on the implications of peak car, namely, "if we’ve really reached peak car, maybe we really can build our way out of congestion after all."

December 6, 2014 - New Geography

Los Angeles Traffic - The Newhall Pass

Induced Demand Explained (or Why We Can't Build Our Way Out of Congestion)

In case you need an easy link to reference when encountering arguments in favor of widening roads and freeways as a solution for traffic, Adam Mann provides an accessible and clear explainer article that sums up the limitations of such strategies.

June 18, 2014 - Wired

Study Says Induced Traffic Effect Too Often Ignored

Despite many studies confirming the effect of induced traffic, the effect is often ignored in the transport models used for project appraisal, says a team of Scandanavian researchers creating an extreme bias in the assessment of new projects.

June 25, 2012 - European Journal of Transport and Infrastructure Research

Explaining Induced Traffic

Eric Jaffe at The Infrastructurist explains the non-intuitive reason why often removing freeways means less traffic.

June 7, 2011 - The Infrastructurist

The Vicious Cycle of Adding Capacity for Cars

Dan Bertolet argues that adding expanding car capacity in cities just inspires more people to drive and ruins the qualities that make the city attractive in the first place.

September 5, 2010 - Publicola

FREE Course: Walkable City 1: Why Walkability?

After describing his path towards focusing on walkability as the essence of good planning, Jeff Speck marches through his five principal reasons for making more walkable places.

Reinventing Malls: Planning Alchemy—Turning Gray Fields Into Gold

The course focuses on the opportunities and imperatives that shape reinvention of mall sites.

Professor of Urban Planning

Harvard University Graduate School of Design

Transportation Planner I

KFH Group Inc.

Director, Strategy and Research

Greater Baltimore Committee

Top Books

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Top Schools

The definitive ranking of graduate planning programs.

100 Most Influential Urbanists

The who's who of urbanism, according to Planetizen readers.

Urban Planning Creators You Should Know

A short list of voices on social, video, and podcasting platforms.