Traffic Engineering

Diverging diamond interchange in Springfield, Missouri.

Diverging Diamond Interchange Puts Drivers on the Left Side of the Road

The unusual design improves traffic flow and reduces the danger of head-on collisions as cars enter the I-5 freeway.

January 5, 2021 - Seattle Times

Wisconsin Capitol

Researchers Analyze Pandemic Transportation Patterns for Planning Lessons

An article details the efforts of Madison-area researchers to glean lessons from the transportation patterns of March and April to inform better planning for the future.

June 10, 2020 - Wisconsin State Journal

Denver, Colorado

Plan for Expanded Road Inconsistent With Denver's Values

The idea of road improvement catering only to cars and congestion didn't pass muster on Quebec Street in Denver. A new plan for the heavily used, but narrow, corridor will prioritize pedestrians, safety, and transit.

December 26, 2019 - Denverite

Pedestrian Safety

'Cars Are Death Machines'

Not one, not two, but three articles in the past week paint dire portraits of the world that cars have created.

October 6, 2019 - The New York Times

Bloor and Major STreets

The Billion-Year-Old Curb Bulbout

Bloor Street didn't land on this billion-year old rock; the rock landed on Bloor Street.

September 20, 2019 - Toronto Star

Traffic Safety Advocates

An Investigation of the Nation's Increasing Number of Pedestrian Fatalities

PBS New Hour takes a deep dive into the climbing number of pedestrian deaths in the United States—now at their highest level in almost three decades.

June 20, 2019 - PBS News Hour

Baltimore MTA Bus

'Complete Streets' Bill Enjoys Broad Support in Baltimore

The city of Baltimore is ready to make a concerted effort in planning for multiple modes of transportation and all users of the public realm.

May 1, 2018 - The Baltimore Sun

New Orleans Fire Truck

San Francisco Has a New 'Vision Zero' Fire Truck

The size of fire trucks frustrates advocates on many sides of the public safety debate. The San Francisco Fire Department sought a solution.

November 10, 2017 - SF.Streetsblog

Emergency Response

Opinion: How Fire Chiefs and Traffic Engineers Make Places Less Safe

Fire standards and street design manuals, meant to protect people, actually make them less safe by damaging walkability and encouraging driving—a classic example of silo thinking.

March 26, 2017 - The Original Green Blog

Case Study of an Unsafe Street

Street Road, a thoroughfare cutting through the Philadelphia suburb of Bensalem, is a public safety disaster. PennDOT is investing in safety along the road, but locals say much more needs to be done.

January 30, 2017 - The Philadelphia Inquirer

The Design Decision Behind Cleveland's Backwards Buffered Bike Lanes

The curious case of Cleveland's new "buffered" bike lanes. The question: Why are the buffers placed between the bike lane and the curb?

September 19, 2015 - Streetsblog USA


First Roundabout Comes to New York City

Roundabouts, not to be confused with traffic circles, are becoming popular throughout the United States. The Bronx will get the first one in NYC. The insurance industry and FHWA consider them far safer than traffic lights and stop signs.

August 3, 2015 - The New York Times - Wheels

'Bike Bill' to Pave the Way for 21st Century Bike Infrastructure in Connecticut

Joseph Cutrufo reports on a bill under consideration in the Connecticut State Legislature that would clear the way for the construction of bike infrastructure that matches the state's complete streets ambitions.

March 17, 2015 - Tri-State Transportation Campaign

Four-Lane Freeway

Reform Transport Engineering: Expand Beyond Just Roadway Level of Service (LOS) Ratings

Transportation engineers currently evaluate urban transport system performance using roadway level of service (LOS) ratings. Here are six good reasons to change.

September 29, 2014 - Todd Litman

In the Inevitable World of the Self-Driving Car, How Will An Intersection Work?

Yes, the subject may seem a little dry at first, but have a look at the intersection modeling shown in Emily Badger's recent article to see what continuously flowing traffic looks like at an intersection. A brave new world indeed.

March 4, 2012 - The Atlantic Cities

Reversible Lanes Puzzle Drivers

The 10-lane Kennedy Expressway in Chicago is forced to manage significantly more traffic than it was designed to handle. Traffic planners have installed a flexible lane that can increase the flow in one direction, but Chicagoans are baffled by them.

August 22, 2011 - The Chicago Tribune

A Traffic Engineer Questions His Profession

Charles Marohn is a traffic engineer. Despite years of training and millenia of precedents, Marohn now feels that the common practice of traffic engineering is creating bad and even unsafe streets.

November 23, 2010 - Strong Towns

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