(Reuters) - Alphabet's self-driving unit, Waymo, is recalling 1,212 vehicles after some cars collided with roadway barriers due to a fault in how the vehicle detected or responded to the objects, the company said on Wednesday.

The affected vehicles have already been fixed with a software update, the company said in a report filed with the National Highway Traffic Safety Administration.

(Reporting by Deborah Sophia in Bengaluru; Editing by Anil D'Silva)