Tiger Woods was driving close to double the 45mph speed limit when he crashed in February, according to Los Angeles County’s sheriff.
The 15-time major champion, 45, had to be “extricated from the wreck” of his car by firefighters and paramedics.
Woods’ car left the road at about 84-87mph and flipped several times during the accident in California.
Woods was released from hospital earlier this month after sustaining a number of serious injuries.
There was no evidence Woods had been impaired by drugs or alcohol at the time of the crash.
LA County sheriff Alex Villanueva said: “The primary causal factor for this traffic collision was driving at a speed unsafe for the road conditions and the inability to negotiate the curve of the roadway.”