The Tesla Model X is a crossover SUV. The prototype was unveiled at Tesla’s design studios in Los Angeles on February 9, 2012. The Model X was developed from the full-size sedan platform of the Tesla Model S. Both are being produced at the Tesla Factory in Fremont, California. A series production vehicle was unveiled on September 29, 2015. It has a panoramic windshield. According to Tesla founder Elon Musk, it is the safest SUV in terms of frontal and side impact crash, being more than twice as safe as the next closest SUV in rollover tests as well. Standard radar-based AEB and ultrasonic-based side collision avoidance system to steer occupants away from a side collision. Tesla developed an ultrasonic sensor that can see through metal to keep falcon doors from hitting nearby objects when opening or closing. Musk claims the car features the first true HEPA filter in a car, with medical grade cabin air cleanliness comparable to that of a hospital operating room. When the car operates at maximum capability, Tesla claims that no viruses, bacteria or spores can be detected in the cabin. The Model X features double hinged falcon doors, which open upwards allowing the leading edge of the door to remain tucked close to the body, unlike traditional gullwing doors. Tesla claims the falcon-wing doors make access easier. The Model X offers room for seven adults and their luggage in three rows of seating and front and rear trunks.