Sorry to say you'll discover that much of it is attributed to humans.
The El Camino BRT project shows why great transit needs exclusive lanes.
Today City Hall celebrates Frida, a 6-pound chihuahua mix and very good girl.
An analysis of roadway suffixes in six major U.S. cities reveals differences rooted in history.
A placemaking project traces the city's long-buried arroyos.
Imagining the bustling nautical society of the Bay Area archipelago.
A local doctor tries to raise awareness about the social causes of Type 2 diabetes, in his community and others.
Researchers say the techno-specs create a "partial peripheral vision obstruction."
The Market Street Prototyping Festival will bring a giant dining room, a roving selfie machine, and other wackiness to the city.
A status report on proposed lines in California, Texas, and the Northeast.
Thieves can quickly pop open the lock with a car jack or pipe, but there are ways to protect yourself.
Organizers of San Francisco's first Disaster Relief Trials think cyclists can play a critical role in times of emergency.
The "Veloloop" emits a low-frequency signal to alert traffic sensors to a cyclist's presence.
Teeny graffiti gets raised to high art.
Faults have stored up more than enough energy for a disaster, according to new research.
What we've learned from our 9-month series on tomorrow's urban mobility.
A new report ranks U.S. metros based on how many jobs residents can access by transit during the morning rush.
Cab-sharing has arrived in a serious way with UberPool and Lyft Line.
In New York City's $4 billion PATH Hub, form overtakes function.