Forbes

Jon Bruner profiles Los Angeles Department of Transportation Engineer Edward Yu, and the ATSAC system run by Yu and his team, which controls the timing of traffic lights at each of the city's 4,114 intersections.

Apple stores are great revenue generators in cities, writes Brian Caulfield, but not just as a one-off. Customers tend to come back for more products and repairs, and the stores themeslves encourage plenty of cross-shopping nearby.

California has 7 of the 20 cities with the poorest air quality, according to a list complied by Forbes. Bakersfield, which has 60 days of unhealthy air a year, takes the top spot for its hot and dusty weather and proximity to oil fields.

In early 2012, Facebook will launch a yet-to-be-named app that will allow 800 million users to access home energy usage information provided by their utility company. This 'Social Energy Application' will help users manage their energy.

The Solar Energy Industries Association (SEIA) is fighting with Congress to extend a popular federal incentive program. Set to end on December 31 this year, the group states that the program could create 37,400 more jobs and add nearly 500 megawatt.

Forbes Magazine picks 15 of the most stressful cities in the United States. To come up with the data, "we analyzed quality-of-life data from the 40 largest metropolitan statistical areas," says Beth Greenfield.

In the third year Forbes has compiled the list, the new data factors included in this year's survey bumped New York City off the list and moved Buffalo into the top spot out of 50 metropolitan areas.

Today's war on drugs isn't all that different from Prohibition, writes Stephen Smith, at least in terms of the urban-suburban divide that underlies policy. As cities' reputations clean up, maybe drug policy will evolve accordingly, too.

While many stories have been written about Detroit's turnaround, it took the top spot on Forbes list of most dangerous cities. Detroit had 1,111 violent crimes reported per 100,000 residents, which included 345 murders, writes John Giuffo.

The argument that increased supply of urban housing will lower prices is rapidly being disproved by successive waves of gentrification throughout American cities. Stephen Smith offers a considered analysis of the economics behind this dynamic.

Researchers found in their analysis of 300 California municipalities that the cities that had slow growth or anti-growth policies were less impacted by the housing crisis, writes Mark Bergen for Forbes.

Washington D.C. drivers are the most accident prone out of 200 largest U.S. cities, according to a study by Allstate Insurance Co. The greater a cities population increases the chance of drivers getting into accidents.

Libertarians opposition toward government backed light-rail ignores the longer history of government's pro-car policies, says Timothy B. Lee, contributor for Forbes.

Bay City, Michigan, which has seen seven consecutive months of rising home prices, is one of 25 metro areas seeing a rebound in their real estate market despite a slow economic recovery, Morgan Brennan reports for Forbes.

As riots engulf London, the role of technology in cities and crime-fighting comes into the spotlight. Some wonder whether this could usher in the age of facial recognition in cities.

This interactive map from Forbes shows, county by county, where Americans moved in 2008.

Joel Kotkin argues that planners too often ignore "the most critical issue" in housing.

Forbes talks with Detroit Mayor Dave Bing about reshaping the city and how those plans will and won't impact long-time residents who may be opposed to change.

Writing for Forbes, Joel Kotkin looks at the fastest-growing cities in the world, and shows how powerhouse cities like New York and Mumbai are being challenged by lesser known places.

Investments in rail systems in cities across America are pulling crucial funding away from better-used bus systems, according to this column from Joel Kotkin. He blames the "density lobby".