Drivers were forced to make some quick moves to avoid a lost load rolling down I-10 and Wayside.
Marie Cervantes said she was driving next to the truck when the spool flew off the vehicle, KHOU reported.
"And that round thing fell, and I saw a big piece of metal flying," Cervantes told the television station.
L.M. Ramirez saw the spool rolling toward his vehicle.
"It was crazy scary," he told KHOU.