A vegetation fire started early on Friday, forcing the entrance onto Highway 101 northbound near Pismo Beach to close.
Around midnight, Cal Fire responded to reports of a fire. The Department of Transportation was later requested.
Together, they are working to determine what exactly was on fire, though officials say it may be something in a drain in the area.
Flames were said to have been on the freeway side of the perimeter fence.
At around 4 a.m., two of the three lanes were closed, but have since been cleared.
The cause of the fire is still unknown. We will continue to provide updates as they become available.
