Amazon's Zoox robotaxi unit is ramping up vehicle production at a new facility in Hayward, California.Amazon's Zoox has cleared a key regulatory hurdle, paving the way for demonstrations of its self-driving robotaxis.The National Highway Traffic Safety Administration said Wednesday that it granted Zoox an exemption from some requirements, a first for U.S.-built vehicles under a recently expanded program."Transportation innovators can be confident in getting speedy review of their vehicles and, as appropriat ...