India, June 18 -- Alphabet's (GOOG) self-driving unit Waymo is recalling 3,871 fifth-generation automated driving systems (ADS) in the U.S. after a software issue was found that could allow vehicles to enter closed freeway construction zones and continue driving through active work areas.

According to a recall notice issued by the National Highway Traffic Safety Administration (NHTSA), the software may fail to recognize certain freeway closure conditions, increasing the risk of a crash.

The recall follows more than a dozen incidents reported since April in California and Arizona, where Waymo autonomous vehicles drove past ramp closure signs and entered pre-planned construction zones or freeway lanes with active roadwork.

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