In the desert outskirts ofCalifornia City, around 100 miles northeast of Los Angeles, cars wrapped in black and white camouflage sit side by side in a wide parking lot. The disguised vehicles prevent spies from detecting never-before-seen automotive shapes or cutting-edge technology, even though they’re deep within a location already chosen to prevent prying eyes.
The California desert hides plenty of secrets, fromnatural wonderstomysterious alien landmarkstohomages to famous rock albums. Most aren’t intentionally hidden — the desert is a natural foil, given that it spans roughly 44% of the state but only holds about 4% of its residents. Still, California’s two proving grounds — Hyundai’s in California City and Honda’s in nearby Cantil — very much want to maintain secrecy.
Consumers may never even set eyes on some of the cars that will spend months driving over manmade pot holes and intentionally rough roads, or sit for hours in a simulated mud bath or high humidity chamber at these preproduction test facilities. If one of the engineers at the Hyundai California Proving Ground decides a car doesn’t meet the company’s standards, it’ll be scrapped altogether. But the millions of Californians driving these vehicles in the historically car-centric state likely have no idea about these sprawling grounds, tucked away and inaccessible to the public.
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A Honda Civic Type R at the Honda Proving Center in Cantil, Calif.
The carmakers have doubled down on their California facilities over the past two decades and have overcome local and environmental concerns to establish the giant complexes, contending that these locations are the best places to test and develop their automotive technology in the U.S. The Golden State isn’t exactly known as an automotive capital, but based on 2025 market share data, roughly 18% to 20% of new passenger vehicles sold in the U.S. are made by Hyundai and Honda combined, giving California more industry weight than most residents likely realize.
Head west on Highway 58 once you’ve arrived at the town of Mojave, and you’ll soon hit Hyundai-Kia Boulevard and glimpse a giant entrance sign towering over a road that appears to lead to nothing. The Hyundai California Proving Ground, a 4,500-acre facility, is tightly guarded and fenced with a bright orange “no trespassing” sign that’s posted immediately after you turn onto the road. Matt Seare, the proving ground’s manager, said people will occasionally show up at its front security gates, wondering if they can have a look, but they’re swiftly turned away. This writer had to sign an NDA and surrender her phone so that workers could tape over its camera before entering. With an employee list of just around 100 people, only a small roster heads through the gates regularly.
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Once inside the perimeter, a staid one-story office building stands as the hub of a mini city — if that city was made up of any possible road a car could drive on. A central oval track is 6.4 miles around and modeled partly after LA highways. More security gates guard each new track and section of the grounds, which are constructed to include every obstacle a car might encounter throughout the nation, from sandpits to cobblestones.
A convoy video is shot at the Hyundai California Proving Ground in California City, Calif.
Source: Drudge Report
