The Country's Most Notorious Road System

Caltrans district 7 includes every freeway in Los Angeles and is perhaps the most notorious road system in the country.

The optimum speed to move traffic through a network is supposed to occur at 45 miles per hour. In Los Angeles, however, it's 60 miles per hour. This means that the "Highway Capacity Manual--the bible of all California freeway engineers--'is pure formula, wrong, based on no empirical formula.' Or maybe we're just beginning to understand how our freeways work, just starting to take the first steps toward a unified field theory of congestion." Think understanding traffic is simple? This fascinating Los Angeles Magazine article explains the art and science of transportation studies.

Thanks to Chris Steins

Full Story: Hard Drive


Book cover of the Guide to Graduate Planning Programs 4th Edition

Thinking about Grad School?

New! 4th Edition of the Planetizen Guide to Graduate Urban Planning Programs just released.
Starting at $24.95

Prepare for the AICP Exam

Join the thousands of students who have utilized the Planetizen AICP* Exam Preparation Class to prepare for the American Planning Association's AICP* exam.
Starting at $209

Stay thirsty, urbanists

These sturdy water bottles are eco-friendly and perfect for urbanists on the go.

A Short History of America

From comic book artist Robert Crumb, poster shows how the built environment has changed throughout the decades.