The top U.S. auto regulator has opened an investigation after a Tesla using an automated driving feature slammed into a Texas home at high speed and killed a 76-year-old woman standing inside. The National Highway Traffic Safety Administration said Monday it was opening a special investigation into the Tesla Model 3 crash, a significant probe since it involves technology that Elon Musk considers key to Tesla’s future. The Tesla CEO is rolling out robotaxis using automated software in several U.S. cities this year. Tesla did not reply to a request for comment, but a top official posted on X that the driver overrode the automated driving system by pressing the accelerator.