Federal traffic safety regulators are looking into suspected problems with Elon Musk’s test run of self-driving “robotaxis” in Texas after videos surfaced showing them braking suddenly or going straight through an intersection from a turning lane and driving down the wrong side of the road.

Tesla’s self-driving taxis appeared to violate traffic laws during the company’s first day offering paid rides, with one customer capturing footage of a left turn gone wrong and others traveling in cars that exceeded posted speed limits.