Japanese auto major Nissan is working on autonomous driving cars and to that effect, it will use the Seamless Autonomous Mobility (SAM) system – derived from NASA-sourced technology – that utilises artificial intelligence to determine if human intervention is required in unusual and unexpected situations. Nissan believes NASA's technology built for the Mars Rover will help control fleets of autonomous vehicles. SAM is adapted from NASA's Visual Environment for Remote Virtual Exploration (VERVE), designed to supervise interplanetary robots like the Mars rovers. NASA scientists may use the system to chart out safe driving paths on other planets. Nissan uses the example of a police officer using hand signals at a traffic junction.