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Another system gives voice prompts about traffic light status, Wan said. "If it senses someone running a red light, it will spray water vapor and warn pedestrians by voice and laser."

Anne Britt Sodefjed, a tourist from Norway, said she wasn't worried.

Ant Group, formerly known as Ant Financial, is best known as the parent company of the Alipay mobile wallet. Alipay and its local wallet partners served more than 1.2 billion users worldwide by June 2019, the company said in October.

Another issue is the possibility that a person with antibodies could be infectious. A German study, published in Nature, found that viral RNA of COVID-19 declines slowly after antibodies are detected in the blood. The presence of viral RNA could mean that the person with COVID-19 antibodies is still shedding the infectious virus.

Any legislative action would have to pass the Democratic-controlled House and Republican-held Senate and receive President Donald Trump's signature.