Joel Angel Juarez | Reuters NHTSA pressed Tesla for more information about robotaxi incidents caught on camera and shared widely on social media on Monday. Tesla started its robotaxi service in Austin, Texas this weekend with 10 to 20 Model Y vehicles equipped with its newest driverless technology, and a human valet in the front passenger seat. The rollout led to an 8% spike in Tesla shares on Monday. Tesla was contacted by the National Highway Traffic Safety Administration on Monday after videos posted on social media showed the company's robotaxis driving in a chaotic manner on public roads in Austin, Texas. Elon Musk's electric vehicle maker debuted autonomous trips in Austin on Sunday, opening the service to a limited number of riders by invitation only. Watch NBC 4 free wherever you are WATCH HERE In the videos shared widely online, one Tesla robotaxi was spotted traveling the wrong way down a road, and another was shown braking hard in the middle of traffic, responding to "stationary police vehicles outside its driving path," among several other examples. A spokesperson for NHTSA said in an e-mail that the agency "is aware of the referenced incidents and is in contact with the manufacturer to gather additional information." Get Tri-state area news delivered to your inbox with NBC New York's News Headlines newsletter. SIGN UP Tesla Vice President of Vehicle Engineering Lars Moravy, and regulatory counsel Casey Blaine didn't immediately respond to a request for comment. The federal safety regulator says it doesn't "pre-approve new technologies or vehicle systems." Instead, automakers certify that each vehicle model they make meets federal motor vehicle safety standards. The agency says it will investigate "incidents involving potential safety defects," and take "necessary actions to protect road safety," after assessing a wide array of reports and information. Money Report