Combating the legacy of Robert Moses requires creative solutions.
Levels of pollution exposure can vary dramatically within a city.
But that won't solve its apocalyptic gridlock.
High tolls can keep a transportation network efficient and equitable. Right now, the city's system accomplishes neither.
How New York cleans 6,000 miles of roads every day.
Who is responsible for Lima's missing road signs? No one seems to know.
The city's demand pricing program balances efficiency with affordability.
For good and bad.
Officials recently decided to prohibit people form using bicycles on nearly 200 streets in the central city during the day.
A very weird plan to send Washington a message by disrupting D.C.'s commuters.
And that's a conservative estimate, writes Brookings economist Clifford Winston.
How Berlin's iconic Ampelmännchen were born and saved from destruction.
One man's crusade to get restaurants, shops and offices to receive all their goods between 10 and 6.
Tom Vanderbilt on how human behavior makes congestion worse than it needs to be.
MIT researchers are working on a potentially massive public-access database of metrics like retail density and delivery frequency.
EU ideas for reducing road freight-related congestion.
California's largest public works project is finally open to traffic.
A hilariously creative effort to stop cars at red lights.
The city's biggest problem isn't suicide bombers or militants... it's the traffic.