A CHP officials says the truck in a fiery crash that brought down an Oakland freeway overturned when its fuel load shifted during a lane change.
An onboard satellite navigation system recorded the truck's speed as 62 miles per hour -- which is above the posted speed limit of 55 miles per hour.
But Steve Vaughn, head of the CHP enforcement service division, told a House subcommittee earlier this week that speed was not the reason for the April crash.
The driver, 51-year-old James Mosqueda, was the only person injured in the early morning crash. He was hospitalized with second-degree burns.
The accident caused a section of Interstate 580 to collapse and disrupted the Bay Area commute for a month. Rebuilding the interchange cost nearly 6 (m) million dollars.