Gary Dean Robinson, 59, was driving a red Dodge Challenger on January 29 and was going more than 100 mph when he ran a red light at an intersection and hit the passenger side of a Toyota Sienna minivan, which rotated and hit another vehicle, the report said.
A preliminary National Transportation Safety Board (NTSB) report released last week said the Dodge driver was going 103 mph as he approached the intersection.
Three adults and four children were in the Toyota Sienna, all of whom died in the crash, North Las Vegas authorities previously said. Robinson and a passenger in his car were also killed, authorities said.
“We are conducting a safety investigation looking at broader safety issues of national significance,” Chapman said in the January briefing. “Our mission is to understand not just what happened but why it happened, and to recommend changes to prevent it from happening again.”