Self-driving robotaxis are already operating in a handful of US cities and in China, with companies betting billions that autonomous vehicles will transform ride-hailing and mobility. Zoox CEO Aicha Evans, Lyft (LYFT) CEO David Risher, Uber (UBER) executive Sarfraz Maredia, AVRide CCO Sergei Kirillov and Harvard's Mark Fagan lay out the timeline, the business model and the biggest risks for robotaxis.

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