Many Americans might not realize that driverless tractor-trailers are currently navigating the nation's highways, hitting the open road with absolutely nobody behind the wheel. Many of us have ridden in a smaller car -- like a Tesla -- that has a driverless feature, but to be in a large freight truck that is maneuvering through cities and highways is a completely different ballgame. It's the future of the industry, but the future is already here. Autonomous driving technology company TuSimple was founded in San Diego in 2015 with a mission to improve the safety and efficiency of the trucking industry. TuSimple is a developer of heavy-duty, self-driving trucks and the autonomous startup has already created a freight network along the Sun Belt from Phoenix to Houston.