Tesla's Full Self-Driving (FSD) software is under investigation by U.S. regulators after multiple fatal crashes, including incidents involving pedestrians in low visibility conditions. The National Highway Traffic Safety Administration (NHTSA) has launched a probe affecting approximately 2.4 million Tesla vehicles. This marks the 14th safety investigation related to Tesla as concerns grow over the automated-driving technology's performance in hazardous conditions. The investigation follows reports of collisions linked to the FSD system, prompting a thorough review by federal safety agencies to assess its safety and reliability. Tesla faces serious scrutiny as the investigation unfolds, amidst ongoing concerns about the software's capability to operate safely in various environments.