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Tesla Motors Inc. Tests Self-Driving Technology
An employee drives a Tesla Motors Inc. Model S electric automobile, equipped with Autopilot hardware and software, hands-free.
Bloomberg via Getty Images

A driver killed on May 7 in a crash in a Tesla using the car's Autopilot software was speeding, the U.S. National Transportation Safety Board said on Tuesday in its preliminary findings.

The preliminary report said the Model S was traveling at 74 miles per hour in a 65 mph zone at the time it struck a semi-truck hauling blueberries near Williston, Florida.

Read More: The SEC Is Investigating Tesla Over the Autopilot Death in May

The report said the NTSB confirmed the Model S driver was using the advanced driver assistance features Traffic-Aware Cruise Control and Autosteer lane-keeping assistance at the time. The NTSB has not yet determined the probable cause for the crash.

Read Next: A Second Self-driving Tesla Crash Is Reported