The National Transportation Safety Board (NTSB) has released new information about its ongoing investigation into a fatal Tesla-truck collision in Florida in 2016 – although it has yet to determine the cause.

The accident occurred on May 7, when a 2015 Tesla Model S 70D, traveling eastbound on US Highway 27A west of Williston, Florida, struck and passed beneath a refrigerated semitrailer powered by a 2014 Freightliner Cascadia truck-tractor. At the time of the collision, the truck was making a left turn from westbound US-27A across the two eastbound travel lanes. The impact with the right side of the semitrailer sheared off the roof of the Tesla. The driver – who was the sole occupant of the Tesla -- died in the crash; the commercial truck driver was not injured.