Venus Williams accelerated from 0 to almost 20 MPH in about 4 seconds as she pulled through the intersection where she had a fatal accident ... according to the attorney for the victims' family.
Michael Steinger, who reps the estate of Jerome Barson -- the man who died -- tells TMZ Sports his team obtained the black box data Tuesday from Venus' SUV. He says it shows she was traveling at 19.9 MPH when Jerome and his wife T-boned her.
Numbers - Venus - Speed - Seconds - Take
He also says the numbers show Venus got up to that speed in 4.2 seconds. His take on the data -- Venus probably "looked up, saw the red light and gunned it."