Tempe/San Francisco — An Uber self-driving car hit and killed a woman crossing the street in Arizona, police said on Monday, marking the first fatality involving an autonomous vehicle. The accident also deals a potential blow to the technology expected to transform transportation. The ride services company said it was suspending North American tests of its self-driving vehicles, which have been under way in Arizona, Pittsburgh and Toronto. So-called robot cars, when fully developed by companies including Uber, Alphabet and General Motors, are expected to drastically cut down on motor vehicle fatalities and create billion-dollar businesses. But Monday’s accident underscored the possible challenges ahead for the promising technology as the cars confront real-world situations involving real people. US legislators have been debating legislation that would speed the introduction of self-driving cars. "This tragic accident underscores why we need to be exceptionally cautious when testing ...

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