It's an attempt to instill rule of law in Chinese cities known for their chaotic roadways.
Even strict controls haven't been able to stop them.
Gary Hustwit and Jon Pack have been photographing former Olympic sites around the world.
Our weekly roundup of the most intriguing articles about cities and urbanism we' ve come across in the past seven days.
Once, developers dreamed of building "the largest amusement park in Asia." But no longer.
Only 4 of the 81 people with confirmed cases of bird flu in China have fully recovered; human transmission still can't be ruled out.
Wildly fluctuating urban air pollution is prompting some residents to seek homes elsewhere. But most Chinese cities suffer similar problems.
A new exhibition of contemporary Chinese photography charts the country's phenomenal growth from 2000 to 2012.
The Chinese capital estimates 10 percent of its population lives in tiny, below-ground apartments. Are they crazy or clever?
"From day one we were getting a lot of phone calls from nervous patients."
In 2010, air pollution contributed to 1.2 million deaths and 2013 looks like it could be even worse.
The air is so bad, cyclists have taken to creating their own breathing contraptions just to get by.
The scandal has prompted China's government to acknowledge the nation's intense problem with food safety.
Buildings that look to that ancient, icy form for inspiration.
We hate to disappoint, but banning BBQ won't do much.
A crippling cyber attack that shuts down our power grid and poisons our water? Not so impossible anymore.
They capture the spirit of transit in a way no photo could.
Rumor has it the Chinese government is considering moving its capital to Xinyang, a small city in Henan Province.