The forthcoming fund focuses specifically on the autonomous taxi services theme.
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In addition to its Rivian deal, Uber has a $300 million partnership with EV-maker Lucid for at least 20,000 robotaxis.
All of the major players are vying for a major share of a ridehailing market estimated at $43 billion in the US and $150 billion worldwide.
Despite initial concern from motorists, robotaxi services are finding plenty of passengers as they expand across the country.