How Flight Delays Spread From Airport to Airport Like a Disease

Air travel congestion can quickly spread from a few cities to a whole network.


Do Big City Drivers Actually Have It Worse?

The latest look at how much time American commuters spend in traffic, and the methodology problems that come along with it.


How Virtual Traffic Lights Could Cut Down on Congestion

Car-to-car communication could decrease urban congestion by 60 percent, one computer scientist says.


The Case Against One-Way Streets

One civil engineer believes trip capacity will increase if cities turn to two-way streets.


4 Great Transportation Projects to Watch (and 4 Awful Ones)

Highlights from the Sierra Club's list of the country's 50 best and worst.


More Cars on the Road Make You Late, But Some Cars Make You Much Later Than Others

A new study suggests that traffic reduction should be targeted at particular communities.

DC's Massive New Transportation Experiment Starts Tomorrow

High-tech high-occupancy tolls come to the nation's capital. Is this the future of highway infrastructure?


Should the Market Alone Determine Parking Supply?

New research finds that parking minimums are indeed bad, but that parking maximums still need fine-tuning.


Once Again, Carmageddon II Was Practically a Non-Issue

Closing 10 miles of Los Angeles's busiest freeway for a second time was as uneventful as officials hoped.


India's Cities Risk Repeating America's Congestion Mistakes

Proposed expansions of dozens of major arteries in Bangalore are threatening the Indian city's way of life.


The Key to Reducing Congestion Could Just Be Less Selfish Driving

Most of us know better than to read and drive, but we’ve all been guilty of bad behavior at one point or another.


The Case for Eliminating Disabled Parking Placards

They invite fraud, drain city revenue, and often fail to help those who need it most — new research proposes an alternative.


Making Sense of Inevitable Transit Delays

Researchers are using rider data to better understand how stressed subway crowds flow through the system.

Paramount Pictures

How Traffic Jams Became a Common Movie Trope

By trapping characters indefinitely, fictional jams can set up otherwise implausible plotlines.


Moscow, Super-Sized

The Russian capital has officially added more than 500 square miles to its footprint.

New York Public Library

Blast From the Transit Solution Past: New York's Moving Sidewalks

A six-mile loop of moving platforms could have been the congestion solution 1903 New York needed.


Could Density Actually Reduce Traffic?

Yes, according to one new study.

Courtesy of Ricardo UK Ltd

The Future of Car Commuting

Road trains — semi-autonomous highway platoons — recently completed a promising trial, but questions remain.


Chicago's Ambitious Plan for Zero Traffic Fatalities

Can a city reduce the number of deaths to zero?