Apple appears to be leasing a former Fiat Chrysler-owned proving grounds in Arizona to test autonomous vehicles, according to a source familiar with the matter. It’s the latest sign that one of the largest technology companies in the world isn’t as done with autonomous vehicles as expected, following the crash of its once-vaunted last year.

Over the last several months, Apple has been recruiting automotive test engineers and technicians from other proving grounds in the state, according to the source. The company signaled its intention is to test autonomous tech, the source said, which tracks with Apple’s revamped approach to self-driving cars.

, after a haphazard effort—dubbed Project Titan—fell into disarray. Now, it’s focused on the underlying technology that can make an autonomous car drive itself.

Last week, that highlighted the company’s work with LIDAR, a laser-based radar that essentially allows a car to see, and earlier this year, Tim Cook, Apple’s CEO, that it’s “focusing on autonomous systems.”

Apple declined to comment. When Jalopnik reached the former manager of the Fiat Chrysler proving grounds in Surprise, Arizona, on Monday to ask if he was aware of the development, he responded, “I’m not answering this question, thanks.”

The proving grounds were used to help Chrysler test the impact of hot temperatures on cars and their components, the Big Three automaker when it originally opened. A from someone who went on a tour of the facility when it was under Chrysler ownership said that the facility contained multiple road surfaces, a high speed oval, steep grades, and areas for wet weather testing. Chrysler could also test corrosion and wear effects on body and paint by “forcing the vehicles through dirt, mud, and gravel in fast succession to pelt them with rock and stone chips and coat them thoroughly,” the report said.

In 2005, the company then-called DaimlerChrysler sold the proving grounds for $312 million to a developer that planned to build 16,500 homes on the site, . The property was annexed by the City of Surprise a few years later, but the housing development plan eventually fell apart, leaving the site unused for the last several years.

Records obtained by Jalopnik show there has been recent activity related to the property. Most recently, Surprise in September 2016 with the site’s owner, which indicates the owner—SFI Grand Vista LLC—intended to lease the property to a company named Route 14 Investment Partners LLC.

The development agreement states that Route 14 is permitted for “all prior and current experimental and proving ground uses” at the site. (SFI Grand Vista representatives couldn’t be reached for comment.)

It isn’t immediately clear how Route 14 is connected to Apple. The company was incorporated in Delaware in 2015, records show, and it’s registered to an entity called the Corporation Trust Company. ( at the Corporation Trust Company’s main office.)

Route 14’s incorporation filings in Arizona and Delaware, obtained by Jalopnik, shed little insight.

The company’s listed manager on the Arizona filing, a “J. White,” couldn’t be reached for comment. The Arizona filing says Route 14's business purpose is: “Acquiring, owning, improving and operating certain land and improvements or any other activities permitted under law.”

Surprise officials had nothing to add, either.

“Because the City has no involvement in leases of private land, we have no knowledge or information about leases of the property you have identified,” said Diane Arthur, communications and marketing director for Surprise. “The property, historically and at various times since, has been used as an automotive proving ground.”

If Apple’s indeed working out of the former Chrysler proving grounds, then the Phoenix area is quickly becoming a hub for work in the self-driving car space, said Bryant Walker Smith, an assistant law professor at the University of South Carolina who focuses on autonomous driving. Carmakers and autonomous tech developers have flocked to Arizona, a state which has promised a hands-off regulatory approach to self-driving cars. Waymo in the Phoenix area, and Uber has been .

Apple publicly reemerged in the self-driving car field in April, when the California Department of Motor Vehicles in three 2015 Lexus RX 450h sport utility vehicles. The permit covered six drivers, who actively monitor the car during testing. Documents later released by the state DMV showed that .

A video of what appeared to be an , revealing a bulky sensor suite atop the vehicle’s roof.

Apple had sky-high ambitions for Project Titan. The company went so far as to consider reinventing the wheel, , and “investigated the possibility of using spherical wheels—round like a globe—instead of the traditional, round ones, because spherical wheels could allow the car better lateral movement.”

Yet despite Apple’s giant stature in tech and record of disruption, Project Titan endured numerous problems, the Times reported, particularly because of its “size and by the lack of a clearly defined vision of what Apple wanted in a vehicle.”

As part of its scaled-back efforts, Apple’s now planning to develop a self-driving shuttle that would transport employees between Apple-owned buildings in California, the Times found.

Despite the missteps with Project Titan, Cook that Apple hasn’t completely backed away from self-driving technology, calling it “the mother of all AI projects.”

“It’s a core technology that we view as very important,” he said.

A paper published this month by Apple researchers indicated the company is focused on LIDAR. Autonomous tech developers typically deploy a combination of cameras, sensors and LIDAR to allow a car to recognize the environment it’s operating in. But Apple’s researchers created a new software approach—dubbed “VoxelNet”—that generated “encouraging results” in 3D detection of pedestrians and cyclists using only LIDAR, the paper stated.

A “big but convenient” space is necessary for Apple to try out things it’s not ready to share publicly—automotive or otherwise, said Walker Smith, the professor. With the former Chrysler Proving Grounds in Surprise, the company would have an ideal environment for testing autonomous cars, he said.

“The satellite view of the proving grounds shows some nicely striped urban street configurations (crosswalks, intersections, etc.),” he said, “which would be important for comprehensive development.”

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