We we might never know why the rig hit the guardrail, because as the story said, the truck and any evidence, electronic or otherwise, were destroyed in the fire.
FMCSA Warns Drivers About Defective Samsung Galaxy Note 7
The FMCSA has issued a safety advisory to drivers and passengers of commercial vehicles, warning them of the risks and regulations associated with transporting damaged or defective lithium batteries and the recently recalled Samsung Galaxy Note 7 device.