Didi, which operates robotaxis in China, has withdrawn from road testing in California. (Didi)

PALO ALTO, California — The distance traveled by major Chinese companies’ self-driving cars in California road tests plunged about 70% last year, official data shows, in another sign of the U.S.-China rift over advanced technology.

The decline in testing in the state’s challenging road environment could have an impact on the Chinese companies’ ability to deploy the technology on a global scale.

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