The National Highway Traffic Safety Administration said it was certifying Amazon’s robotaxi service for demonstration purposes, while also ending the investigation into whether the company sidestepped safety regulations. The exemption was the first under NHTSA’s newly streamlined regulatory process for approving vehicles without traditional controls, like steering wheels and pedals. As part of the agreement, Zoox is required to “remove or obscure” all references to its purpose-built autonomous shuttles complying with federal motor vehicle safety regulations.