By Alanna Petroff and Charles Riley @CNNMoney March 21, 2016: 10:03 PM ET
Shenzhen
8 of 12
In the 1980s, Shenzhen was the first Chinese city to be designated a Special Economic Zone. Now, the city bills itself as China's "Silicon Valley."
But a massive economic boom has also resulted in epic traffic problems. Last year, congestion increased 3%, according to TomTom.
First published March 21, 2016: 10:03 PM ET
Source: TomTom Traffic Index 2016 The TomTom index is based on data from vehicles driving across each city's road network. The evening rush hour ranking is based on time added to a congestion-free journey of 30 minutes.
