SANTA CLARA, Calif. (CBSNEWS.COM) – A Tesla vehicle was tricked into speeding by researchers who put electrical tape over a speed limit sign. The findings, released Wednesday by security firm McAfee, highlight possible difficulties with autonomous driving systems.

The logo marks the showroom and service center for the U.S. automotive and energy company Tesla. (credit: John Thys/AFP via Getty Images)

McAfee technicians fooled the car into reading the speed limit as 85 miles per hour by placing black tape across the middle of the first digit on a 35 mile per hour sign. That caused the vehicle’s cruise control system to automatically accelerate.

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