How robotaxis are dividing San Francisco

My heartbeat quickens just a little as the cab approaches. It's a bizarre sight, one that I thought I wouldn't see in my lifetime.

The cab has no driver. It stops in front of me and invites me to unlock its door with my phone - before whisking me into the night.

But as I am about to get in, a passer-by approaches.

"They're unsafe," he tells me. He says he saw someone nearly get run over by a robotaxi - and warns me to be careful.

He represents a...