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SAN DIEGO — Three separate tractor-trailer trucks jackknifed on rain-slicked Interstates 5 and 805, forcing authorities to shut down freeway lanes in Del Mar, Chula Vista and Oceanside during the Friday morning commute.

A big rig lost control, began to hydroplane across the southbound lanes and struck the concrete wall in the center median.  The semi came to rest blocking several southbound lanes on Interstate 5 near the Del Mar Fairgounds at around 3:40 a.m. No one was injured in the collision, but authorities closed all but one lane while they cleared the wreck and cleaned up diesel fuel form the roadway.

As of 7:30, all lanes but the slow lane had been reopened, but southbound traffic remained backed up into Carlsbad . The California Highway Patrol estimated that they would reopen that lane around 9 a.m.

In the South Bay, northbound Interstate 805 just north of E Street heading into National City, another jackknifed tractor-trailer shut down all northbound lanes at about 3:15 a.m.

Two CHP officers were also injured that accident. Both officers were hospitalized with minor injuries. By 7 a.m., the crash had been cleaned up, but traffic remained backed up through the area.

A third big-rig accident blocked traffic on northbound I-5 in Oceanside. The truck overturned at about 7:35 a.m. and was blocking the two right-hand lanes. No one was injured.