DETROIT, March 12 Reuters Tesla39;s Autopilot and Full Self Driving technology and nine other assisteddriving systems marketed by major automakers received poor ratings from the U.S. Insurance Institute for Highway Safety in a new study released on Tuesday.

The IIHS, a safety research arm of the insurance industry, also said there is no evidence that Autopilot or other assisteddriving systems have realworld safety benefits, based on crash data.

We are able to look at insurance claims data. We have been able to look at vehicles with and without these systems and determine there is no reduction in claims as a result of these more advanced systems, IIHS President David Harkey told Reuters.

By comparison, there is evidence that automatic emergency braking systems cut rearend collisions by 50 and cut incidents of a vehicle hitting a pedestrian by 30, he said.

Tesla and its chief executive, Elon Musk, have said that a Tesla operating with Autopilot engaged is about 10 times safer than the U.S. average and five times safer than a Tesla without the technology enabled.

Federal regulators are investigating nearly 1,000 accidents in which Tesla39;s Autopilot was in use. A civil case scheduled to go to trial next week in California will be the latest test of Tesla39;s strategy of blaming crashes on drivers who fail to heed the EV maker39;s warnings to pay attention to the road when Autopilot or Full Self Driving technology are engaged.

Tesla did not reply to an email seeking…