It isn't clear what caused the fire, but Arturo Montiel, a spokesman for the highway patrol, said the fire was concentrated in the rear of the car, and not in the engine column.

WSJ: Limo Fire on Bridge Kills Five

The engine hood on the Roadster has a new central spinal column with two pairs of hexagonal windows connected at the sides as if they were plates of armor.

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The Eyes on the Road column on Thursday incorrectly said the U.S. Focus had a turbocharged engine.

WSJ: Corrections & Amplifications