Chopper11 HD was over the blaze near Knightdale, as crews worked to get the fire under control. At one point, firefighters had trouble getting to the growing flames.
The fire burned about 20 acres near the Knightdale Boulevard exit off I-540. Two lanes of I-540 Eastbound had to be closed due to emergency vehicles on the shoulder.
No homes were ever in danger, however, a couple of small buildings or sheds in the middle of the field did burn.
It is unclear at this time how the fire started.