International Workers’ Day falls on May 1, and on this day we’re looking at one of China's fastest growing – and most dangerous – industries.

Cao Rong is among the millions of online food delivery drivers in China.

With a tap or two, consumers can get food delivered straight to them in China’s sprawling cities, often in 30 minutes or less.

This $33 billion industry creates countless job opportunities for people like Cao – but it also puts lives at risk.

With drivers rushing to take on more and more deliveries in order to make more cash, accidents are all too common.

But when you’ve got a child to look after, sometimes the rewards are far more important than the risks.

Migrant workers