The country's biggest fleet of low-speed, self-driving electric shuttles hit the road on Tuesday in a major step forward for the electric vehicle sector. The unveiling here adds momentum to an industry that is poised to get a significant boost from the Biden administration and Democrats in Congress. "We will write the next chapter in the world's transportation history -- in a time when we need a new chapter desperately," said Tyler Svitak, executive director of the Colorado Smart Cities Alliance, a sponsor of the shuttle system. The six-passenger miniature trolley-type vehicles from French company EasyMile are a sharp contrast to the large, diesel-burning buses known on many crowded college campuses. Each shuttle, called the Mines Rover, uses advanced sensors, cameras and LiDAR, which those involved say limit the risk of human error to about 94 percent of vehicle-related fatalities. A Mines student trained to oversee operations will ride on each vehicle.