Firefighters clean up after knocking down a fire that consumed the cab of a big rig on the shoulder of northbound Interstate 5, north of Valencia Boulevard, in Valencia on Monday. Two engine companies were first called at 5:56 p.m. and knocked down the fire about five minutes after arrival, said Los Angeles County Fire Capt. Daryl Goulet. No other vehicles were involved, and there were no injuries, Goulet said.