DETROIT (AP) — The U.S. government’s road safety agency is investigating Tesla’s “Full Self-Driving” system after getting reports of crashes in low-visibility conditions, including one that killed a pedestrian.

The National Highway Traffic Safety Administration said in documents that it opened the probe on Thursday after the company reported four crashes when Teslas encountered sun glare, fog and airborne dust.

In addition to the pedestrian’s death, another crash involved an injury, the agency said.

Investigators will look into the ability of “Full Self-Driving” to “detect and respond appropriately to reduced roadway visibility conditions, and if so, the contributing circumstances for these crashes.”

The investigation covers roughly 2.4 million Teslas from the 2016 through 2024 model years.

A message was left Friday seeking comment from Tesla, which has repeatedly said the system cannot drive itself and human drivers must be ready to intervene at all times.

Last week Tesla held an event at a Hollywood studio to unveil a fully autonomous robotaxi without a steering wheel or pedals. Musk, who has promised autonomous vehicles before, said the company plans to have autonomous Models Y and 3 running without human drivers next year. Robotaxis without steering wheels would be available in 2026 starting in California and Texas, he said.

The investigation’s impact on Tesla’s self-driving ambitions isn’t clear. NHTSA would have to approve any robotaxi without pedals or a steering wheel, and it’s unlikely that would happen while the investigation is in progress. But if the company tries to deploy autonomous vehicles in its existing models, that likely would fall to state regulations. There are no federal regulations specifically focused on autonomous vehicles, although they must meet broader safety rules.

NHTSA also said it would look into whether any other similar crashes involving “Full Self-Driving” have happened in low visibility conditions, and it will seek information from the company on whether any updates affected the system’s performance in those conditions.

“In particular, this review will assess the timing, purpose and capabilities of any such updates, as well as Tesla’s assessment of their safety impact,” the documents said.

Tesla reported the four crashes to NHTSA under an order from the agency covering all automakers. An agency database says the pedestrian was killed in Rimrock, Arizona, in November of 2023 after being hit by a 2021 Tesla Model Y. Rimrock is about 100 miles (161 kilometers) north of Phoenix.

The Arizona Department of Public Safety said in a statement that the crash happened just after 5 p.m. Nov. 27 on Interstate 17. Two vehicles collided on the freeway, blocking the left lane. A Toyota 4Runner stopped, and two people got out to help with traffic control. A red Tesla Model Y then hit the 4Runner and one of the people who exited from it. A 71-year-old woman from Mesa, Arizona, was pronounced dead at the scene.

The collision happened because the sun was in the Tesla driver’s eyes, so the Tesla driver was not charged, said Raul Garcia, public information officer for the department. Sun glare also was a contributing factor in the first collision, he added.

Tesla has twice recalled “Full Self-Driving” under pressure from NHTSA, which in July sought information from law enforcement and the company after a Tesla using the system struck and killed a motorcyclist near Seattle.

The recalls were issued because the system was programmed to run stop signs at slow speeds and because the system disobeyed other traffic laws. Both problems were to be fixed with online software updates.

Critics have said that Tesla’s system, which uses only cameras to spot hazards, doesn’t have proper sensors to be fully self driving. Nearly all other companies working on autonomous vehicles use radar and laser sensors in addition to cameras to see better in the dark or poor visibility conditions.

Musk has said that humans drive with only eyesight, so cars should be able to drive with just cameras. He has called lidar (light detection and ranging), which uses lasers to detect objects, a “fool’s errand.”

The “Full Self-Driving” recalls arrived after a three-year investigation into Tesla’s less-sophisticated Autopilot system crashing into emergency and other vehicles parked on highways, many with warning lights flashing.

That investigation was closed last April after the agency pressured Tesla into recalling its vehicles to bolster a weak system that made sure drivers are paying attention. A few weeks after the recall, NHTSA began investigating whether the recall was working.

NHTSA began its Autopilot crash investigation in 2021, after receiving 11 reports that Teslas that were using Autopilot struck parked emergency vehicles. In documents explaining why the investigation was ended, NHTSA said it ultimately found 467 crashes involving Autopilot resulting in 54 injuries and 14 deaths. Autopilot is a fancy version of cruise control, while “Full Self-Driving” has been billed by Musk as capable of driving without human intervention.

The investigation that was opened Thursday enters new territory for NHTSA, which previously had viewed Tesla’s systems as assisting drivers rather than driving themselves. With the new probe, the agency is focusing on the capabilities of “Full Self-Driving” rather than simply making sure drivers are paying attention.

Michael Brooks, executive director of the nonprofit Center for Auto Safety, said the previous investigation of Autopilot didn’t look at why the Teslas weren’t seeing and stopping for emergency vehicles.

“Before they were kind of putting the onus on the driver rather than the car,” he said. “Here they’re saying these systems are not capable of appropriately detecting safety hazards whether the drivers are paying attention or not.”

DETROIT (AP) — Hyundai is telling the owners of nearly 1,600 Nexo hydrogen fuel cell vehicles in the U.S. and Canada to park them outdoors and away from structures due to the risk of fuel leaks and possible fires.

The Korean automaker is recalling the hydrogen-powered SUVs from the 2019 through 2024 model years.

Hyundai says in documents posted Thursday by U.S. safety regulators that a pressure relief device can break and cause a hydrogen leak. That could cause a fire even while the SUVs are parked.

The company says the SUVs can still be driven but should be parked outside until repairs are made.

Hyundai says it has no reports of fires anywhere across the globe.

Owners will be notified by letter starting Dec. 10. Dealers will replace the pressure release devices.

The automaker said in a statement that it’s doing the recall “to ensure the safety of its customers.”

Owners with questions can go to https://autoservice.hyundaiusa.com/campaignhome or call Hyundai customer service at (800) 633-5151.

ASHEVILLE (AP) — A rare copy of the U.S. Constitution printed 237 years ago sent to the states to be ratified is being auctioned Thursday evening in North Carolina.

Brunk Auctions is selling the copy — the only of its type thought to be in private hands. The minimum bid of $1 million has already been made. There is no minimum price that must be reached.

This copy was printed after the Constitutional Convention finished drafting the proposed framework of the nation’s government in 1787 and sent it to the Congress of the ineffective first American government under the Articles of Confederation, requesting they send it to the states to be ratified by the people.

It’s one of about 100 copies printed by the secretary of that Congress, Charles Thomson. Just eight are known to still exist and the other seven are publicly owned.

Thomson likely signed two copies for each of the original 13 states, essentially certifying them.

What happened to the document up for auction between Thomson’s signature and 2022 is not known.

Two years ago, a property was being cleared out in Edenton in eastern North Carolina that was once owned by Samuel Johnston. He was the governor of North Carolina from 1787 to 1789 and oversaw the state convention during his last year in office that ratified the Constitution.

The copy was found inside a squat, two-drawer metal filing cabinet with a can of stain on top, in a long-neglected room piled high with old chairs and a dusty book case, before the old Johnston house was preserved. The document was a broad sheet that could be folded one time like a book.

Along with the Constitution on the broad sheet printed front and back is a letter from George Washington asking for ratification. He acknowledged there will have to be compromise and that rights the states enjoyed will have to be given up for the nation’s long-term health.

Auction officials are not sure what the document might go for because there is so little to compare it to. The last time a copy of the Constitution that was sent to the states sold, it was for $400 in 1891. In 2021, Sotheby’s of New York sold one of only 14 remaining copies of the Constitution printed for the Continental Congress and delegates to the Constitutional Convention for $43.2 million, a record for a book or document.

Other items up for auction in Asheville include a 1776 first draft of the Articles of Confederation and a 1788 Journal of the Convention of North Carolina at Hillsborough where representatives spent two weeks debating if ratifying the Constitution would put too much power with the nation instead of the states.

The auction was originally set for Sept. 28, but the auction house delayed it after Hurricane Helene caused catastrophic damage through Asheville and the rest of the North Carolina mountains.