DETROIT — Manufacturers reported nearly 400 crashes over a 10-month period involving vehicles with partially automated driver-assist systems, including 273 with Teslas, according to statistics released Wednesday by U.S. safety regulators.

The National Highway Traffic Safety Administration cautioned against using the numbers to compare automakers, saying it didn’t weight them by the number of vehicles from each manufacturer that use the systems, or how many miles those vehicles traveled.

Automakers reported crashes from July of last year through May 15 under an order from the agency, which is examining such crashes broadly for the first time.

“As we gather more data, NHTSA will be able to better identify any emerging risks or trends and learn more about how these technologies are performing in the real world,” said Steven Cliff, the agency’s administrator.

Waymo, the autonomous vehicle unit of Alphabet Inc., said it has more than 700 autonomous vehicles in its fleet.

Waymo also operates a number of autonomous heavy-and light-duty trucks. Crash data on those vehicles was not included in the NTSB report.

The company is running a fully autonomous ride-hailing service in Arizona and testing one in California. The company said all the crashes happened at low speeds, with air bags inflating in only two of them.

In 108 of the crashes involving fully autonomous vehicles, no injuries were reported, and there was only one serious injury. In most of the crashes, vehicles were struck from the rear.

Tesla’s crashes happened while vehicles were using Autopilot, “Full Self-Driving,” Traffic Aware Cruise Control, or other driver-assist systems that have some control over speed and steering. The company has about 830,000 vehicles with the systems on the road.

The next closest of a dozen automakers that reported crashes was Honda, with 90. Honda says it has about six million vehicles on U.S. roads with such systems. Subaru was next with 10, and all other automakers reported five or fewer.

In a June 2021 order, NHTSA told more than 100 automakers and automated vehicle tech companies to report serious crashes within one day of learning about them and to disclose less-serious crashes by the 15th day of the following month. The agency is assessing how the systems perform and whether new regulations may be needed.

Six people were killed in the crashes involving driver-assist systems, and five were seriously hurt, NHTSA said. Of the deaths, five occurred in Teslas and one was reported by Ford. Three of the serious injuries were in Teslas, while Honda and Ford each reported one.

Tesla’s crash number may appear elevated somewhat because it uses telematics to monitor its vehicles and get real-time crash reports. Other automakers don’t have such capability, so their reports may come slower or crashes may not be reported at all, NHTSA said. A message was left seeking comment from Tesla.

Tesla’s crashes accounted for nearly 70% of the 392 reported by the dozen automakers. Although the Austin, Texas, automaker calls its systems Autopilot and “Full Self-Driving,” it says the vehicles cannot drive themselves and the drivers must be ready to intervene at all times.

Auto safety advocates said driver-assist and self-driving systems have potential to save lives, but not until NHTSA sets minimum performance standards and requires safety improvements to protect all road users.

“It’s clear that U.S. road users are unwitting participants in beta testing of automated driving technology,” said Cathy Chase, president of Advocates for Highway and Auto Safety.

Sen. Edward Markey, D-Mass., said that although NHTSA’s data has limitations, it’s not isolated evidence that Tesla has ignored regulations, putting the public in danger. There has been “a never-ending parade of reports” of Teslas on automated systems rolling through stop signs or braking for no reason, he said. NHTSA also is investigating Teslas that crash into parked emergency vehicles.

“As today’s data suggests, this contempt for auto safety laws has real-world consequences,” Markey said while urging NHTSA to take enforcement action.

But many Tesla owners love the automation. Craig Coombs of Alameda, California, said he uses the systems in stop-and-go traffic and on frequent highway trips. “They really reduce driver fatigue overall,” he said.

He gives himself a “moderate” grade for paying attention while using the system but says he never takes his mind off the road entirely. He knows the technology isn’t perfect and said he has had to take over driving at times.

Manufacturers were not required to report how many vehicles they have on the road that have the systems, nor did they have to report how far those vehicles traveled, or when the systems are in use, NHTSA said. At present, those numbers aren’t quantifiable, an agency official said.

However, NHTSA has used the data to seek a recall, open investigations and provide information for existing inquiries, officials said.

“This will help our investigators quickly identify potential defect trends that can emerge,” Cliff said. “These data will also help us identify crashes that we want to investigate and provide more information about how people in other vehicles interact with the vehicles.”

Honda said it has packaged the systems to sell more of them, which could influence its numbers. “The population of vehicles that theoretically could be involved in a reportable event is much greater than the population of vehicles built by automakers with a less-aggressive deployment strategy,” the company said.

Also, reports to NHTSA are based on unverified customer statements about whether automated systems were running at the time of a crash. Those crashes may not qualify for reporting to NHTSA after more data is gathered, Honda said.

NHTSA’s order also covered companies that are running fully autonomous vehicles, and 25 reported a total of 130 crashes. Google spinoff Waymo led with 62, followed by Transdev Alternative Services with 34 and General Motors-controlled Cruise LLC with 23.

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