A collision along Northbound Interstate 5 in Carlsbad slowed traffic to a crawl early Tuesday.
The California Highway Patrol shut down all lanes traveling north along I-5 near Cannon Boulevard for a collision between a tractor trailer and two cars that occurred at 5:15 a.m.
No injuries were reported but there was a significant amount of debris on the roadway.
CHP officers expected the mess to be cleared by 6 a.m.
By 7 a.m., all lanes were reopened to traffic.
At one point in the morning, the gridlock stretched as far south as the La Costa Avenue exit.