UPDATE (6 p.m.) - CAL FIRE SLO says 37.7 acres burned. Crews have been released from the scene.
UPDATE (1:35 p.m.) - Caltrans has issued a SigAlert for the area.
UPDATE (1:15 p.m.) - Firefighters appear to have knocked down the flames on the fire along Highway 46 West near Shandon, but say crews will be on scene mopping up for several hours.
Traffic is impacted in there area due to only one lane being open.
ORIGINAL STORY: CAL FIRE crews are responding to reports of a vegetation fire in northern San Luis Obispo County.
The call first came in at about 11:40 a.m. Friday of a vehicle fire that had spread to vegetation along Highway 46 near Bitterwater Road in the Shandon area.
Fire officials says as of 12 p.m., the wind-driven fire was about four acres in size and had the potential to spread to 20 acres.
One lane of traffic is open in the area.
This is a developing story and will be updated as information becomes available.