The National Highway Traffic Safety Administration said Monday it has opened a preliminary probe into about 2,000 Waymo self-driving vehicles after reports that the company’s robotaxis may have failed to follow traffic safety laws around stopped school buses.

The probe is the latest federal review of self-driving systems as regulators scrutinize how driverless technologies interact with pedestrians, cyclists and other road users.

NHTSA said the Office of Defects Investigation opened the review after flagging a media report describing an incident in which a Waymo autonomous vehicle did not remain stationary when approaching a school bus with its red lights flashing, stop arm deployed and crossing control arm extended.

The probe is the latest federal review of self-driving systems as re

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