This is an archived article that was published on sltrib.com in 2016, and information in the article may be outdated. It is provided only for personal research purposes and may not be reprinted.

Washington • Federal investigators say the driver who was killed when his Tesla sedan crashed while in self-driving mode was speeding just before hitting the side of a tractor-trailer.

The National Transportation Safety Board said in a preliminary report Tuesday that the Tesla Model S was traveling at 74 mph in a 65-mph zone on a divided highway in Williston, Florida, near Gainesville.

The report says the driver, Joshua Brown, 40, a tech company owner from Canton, Ohio, was using the sedan's cruise control and lane-keeping features at the time. Those features are part of the vehicle's Autopilot self-driving system, but the NTSB report doesn't mention the system.

The National Highway Traffic Safety Administration, which also is investigating the crash, has said the Autopilot was engaged.