CAMP PENDLETON - A wrong-way driver's car crashed into three other vehicles on Interstate 5 near Camp Pendleton on Sunday, snarling northbound traffic.

Traffic backed up past the San Onofre checkpoint following the head-on crash, which blocked three lanes of the northbound freeway, according to the California Highway Patrol.

The woman was spotted driving a small sedan at a high speed in the center median south in the northbound lanes between Basilone and Las Pulgas roads about 12:20 p.m., the CHP reported.

Sunday's four-vehicle collision involved a green Toyota Sienna minivan, a silver Toyota Camry, a blue Toyota Highlander and another undescribed vehicle. Wreckage blocked the three left lanes and a SigAlert was issued at 12:28 p.m., as traffic squeezed by in the one remaining lane.

An ambulance was required, according to the CHP, but it was unclear how many people were injured in the crash.

Three tow trucks were called to remove the wrecked vehicles, according to the CHP.