Volvo just released a short, highly produced video of its autonomous truck driving itself through an underground mine as a demonstration of its technology in rough conditions. It also features a Volvo executive risking his life by playing chicken with the driverless vehicle.But in a statement accompanying the video, Holmström admits the stunt made him nervous. “No matter what type of vehicle we develop, safety is always our primary concern and this also applies to self-driving vehicles,” he said. “I was convinced the truck would stop but naturally I felt a knot in my stomach until the truck applied its brakes!” The specially equipped Volvo FMX is still just a concept, but the Swedish automaker says it hopes to roll out a whole fleet as part of a project aimed at improving the transport flow and safety in mines.