The black box in Rebecca Grossman’s white Mercedes SUV showed she was speeding at 81 mph just a second-and-a-half before the horrific crash that killed two young brothers, the jury at the wealthy socialite’s murder trial heard Wednesday.‘Had the vehicle been moving at the posted speed limit (45mph), there would have been no crash,’ said collision investigator Michael Hale, who analyzed the data from the car’s event data recorder or black box.Another crash investigator also told the court the children 'were hit at freeway speed'.
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