Sommer Mathis

When We Were Still Getting Used to Traffic Lights

An archival film from 1937 explains how automatic traffic signals worked in different cities across the country

2011 Major League Baseball Regular Season: Attendance by Team

Philadelphia tops the regular season attendance list for the first time in franchise history

Walk Score Offers Apartment Searches Based on Commuting Time

Data from 209 transit agencies combines with Craigslist rental listings

Reuters/Kim Kyung Hoon

The Future of GPS Data in Smarter Planning

Researchers in Beijing are working with taxi drivers to identify the sources, not just the locations, of congestion

Still from 'Sub City Paris,' by Sarah Klein and Tom Mason

Sub City: If Only All Commutes Were This Serene

A pair of New York-based filmmakers marvel in, and just above, the underground

By Flickr user granth, used under a Creative Commons license

Welcome to The Atlantic Cities

What you should—and shouldn't—expect from The Atlantic's newest website

State of Play: Playground Infrastructure in 20 Major U.S. Cities

Which major U.S. cities provide the best, and worst, mix of playgrounds for their youngest residents?

Detroit: City on the Move

A 1965 promotional film for Detroit reminds us how far the city fell behind