Volkswacht Bodensee - GM driverless car unit recalls vehicles after accident

The company, which is the first to have deployed driverless taxis in San Francisco in June, sent a notice this week to the US agency in charge of road safety, the National Highway Traffic Safety Administration (NHTSA).

In filings which came to public attention Thursday, Cruise explains that on June 3 one of its cars was hit from the rear by another vehicle after breaking sharply while making an unprotected left turn.

The self-driving vehicle decided "a hard brake was necessary to avoid a severe front-end collision with an oncoming vehicle," the document said.

Two people were slightly injured, according to a report submitted to the California Department of Motor Vehicles.

Police determined that the other vehicle was primarily responsible for the incident as it was not in the correct lane and was traveling over the speed limit.

The NHTSA, however, did not fully exonerate Cruise from liability, stating that the software could, "in certain circumstances when making an unprotected left, cause the ADS (automated driving system) to incorrectly predict another vehicle's path or be insufficiently reactive."

Cruise has modified the software and says were the vehicle to be in the same situation again, it would act differently to avoid error.

Carmakers, led by Tesla, have been working for several years on development of autonomous driving and driving assistance systems, but progress has been slower than initially hoped.

Waymo, a Cruise rival and subsidiary of Google's parent company Alphabet, has offered a ride-hailing program in Phoenix, Arizona for several years.

Cruise is the first company to be granted permission to transport passengers for a fee in a larger city.

H.Seidel--BTB