The biggest one is simply that Americans drive more.
Innovative programs have helped turn the city from one of the world's most dangerous places into one of the safest areas in Mexico.
The country reconsiders a massive rail project.
Images of Seattle and Barcelona offer fresh insight into the way pedestrians interact with the built environment.
Car-to-car communication could decrease urban congestion by 60 percent, one computer scientist says.
For too many American families, this is not a problem that's easily solved.
China's rail systems will handle an average of 5.2 million trips a day.
The need for better awareness about traffic strategies is quite clear.
Riders on Washington, D.C.'s Green Line endured hours of chaos and panic Wednesday night.
The blast was so strong it sent some cars flying off the bridge, and still more trucks were found crushed underneath the debris.
The secret to catching a train there, revealed.
The "car effect" explains why so many people choose to drive even when it's not in their best interest.
It's true – this 1960s video of L.A.'s "Red Car" rail system proves it!
The Germans – of course – are working on it.
Go ahead. Add a bike lane.
"Whiteout conditions" appear to have caused at least 30 drivers to lose control of their vehicles.
An ad campaign targeting transit in San Francisco, Chicago, and Washington corrects a few misinterpretations of the word "Jihad."
One civil engineer believes trip capacity will increase if cities turn to two-way streets.