A truck driver escaped injury when his semi burst into flames Tuesday on a San Diego highway.
California Highway Patrol Officers say the semi collided with a mattress just before the truck caught fire.
A Sig Alert was issued just before 2 p.m. along southbound Interstate 805 at Plaza Boulevard in National City.
Three lanes and a highway on ramp were closed by the incident.
Firefighters had the semi fire under control within 20 minutes. The driver was the only person in the semi. He made it out without injury, officials said.
No other information was immediately available.
Check back for updates on this breaking news story.