A Model S with sits on display at the Tesla store in the Short Hills Mall in Short Hills, NJ, Wednesday, March 12, 2014.
Emile Wamsteker—Bloomberg/Getty Images
By Denver Nicks
March 28, 2014

The United States’ federal highway safety regulator has closed its investigation into battery fires in Tesla’s Model S electric cars.

“A defect trend has not been identified,” the National Highway Traffic Safety Administration said in its report this week.

The regulator opened the investigation after three battery fires last year raised questions about the vehicle’s safety. The NHTSA said Tesla has made sufficient design tweaks to “reduce the frequency of underbody strikes and the resultant fire risk.”

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