Self-driving cars must shift up a gear

Commuters may dream of autonomous vehicles that relieve the hassle of driving, but the reality of urban centers means the technology still has a way to go. Andrea Deng reports from Hong Kong.

Jayson Au had been cruising hassle-free in his Tesla Model S. He had turned on Autopilot, the car's driver assist feature, and was feeling relaxed as he passed through Hong Kong's Cross-Harbour Tunnel to pick up his family after a trip to Macao.

Suddenly, he was snapped awake by the din of an alarm.