Each morning at a ZTO Express sorting center in Dengkou County, north China's Inner Mongolia Autonomous Region, the hum of electric engines from driverless delivery vans signals a new working day.

Each morning at a ZTO Express sorting center in Dengkou County, north China's Inner Mongolia Autonomous Region, the hum of electric engines from driverless delivery vans signals a new working day.

Beyond the “shut the door to keep out snakes” sign lies a workplace like no other; some days are joyous, some are tragic – ...