Investment of up to $1.25 billion in Rivian.
Deployment of 50,000 fully autonomous robotaxis.
Partnership aims for rollout in several countries.
Briefing: Uber to invest up to $1.25 billion in EV maker Rivian in deal to launch 50,000 robotaxis
Strategic angle: Uber plans to invest in Rivian to deploy a fleet of autonomous robotaxis by 2031.