Investigators say Tesla car was speeding at time of crash

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 is also investigating the crash, has previously said the Autopilot was engaged.

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