Tesla (TSLA) stock revved higher in pre-market trading today after safety regulators closed an investigation into its Actually Smart Summon vehicle feature. No Action Needed The U.S. National Highway Traffic Safety Administration (NHTSA) said today that it had closed its over-a-year-long investigation into the EV giant’s feature that allows users to remotely move vehicles over short distances in parking areas using a smartphone app while maintaining continuous supervision. The agency concluded ​