The driverless ride-hailing service Waymo issued a recall for 1,212 vehicles after a series of minor crashes involving obstacles in the road.

Alphabet’s Waymo this week recalled more than 1,200 self-driving vehicles over a software glitch that could make the cars more likely to crash into chains, gates and other roadway barriers following an investigation by auto safety regulators.

The recall affects 1,212 Waymo vehicles operating on the company's older fifth-generation automated driving system (ADS) software. Waymo has over 1,500 vehicles on the road across San Francisco, Los Angeles,