Welcome back to TechCrunch Mobility, your hub for the future of transportation, and now, more than ever, the role AI is playing in it.

Waymo argued that fully autonomous vehicles aren't possible without using a mix of sensors and warned that pure end-to-end AI systems aren't safe enough.

Waymo will begin inviting riders on a rolling basis and slowly ramp up access in the three cities, following its usual commercial playbook.