A big rig driver lost control of his truck, traveling down an embankment and coming to rest beneath Interstate 805 near National City.
CHP officials declared a SigAlert at 5:58 a.m., temporarily closing ramps from I-805 southbound to State Route 54 in both directions.
The driver was traveling along I-805 southbound when the truck drove off the highway and landed near the base of the overpass without hitting any other vehicles, CHP officials said.
No one was injured.
CHP removed the tractor trailer at around 6:50 a.m. so the ramps could be reopened.
Check back for updates in this developing story.