Firefighters put out a brush fire Monday off the shoulder of northbound Interstate 15 near Poway Road.
One acre burned around 12:48 p.m. on I-15 at Poway Road near Sabre Springs, according to San Diego Fire-Rescue crews.
Heavy smoke was reported in the area. Crews jumped on the fire and contained it to just one acre.
No one was injured and no structures were threatened.
California Highway Patrol officials say the four, five and six lanes of NB I-15 and the Poway Road off-ramp were closed.
No other information was available.