Traffic on the I-215 slowed to a standstill Sunday morning after a vehicle towing a trailer overturned.
The crash occurred at 9:49 a.m. on the northbound I-215 freeway, just north of Newport Road in Menifee, according to Riverside County Fire Department spokeswoman Jody Hagemann.
A Toyota 4-Runner towing a trailer was entering the freeway on the northbound Newport on-ramp when the trailer began to track alongside of the vehicle, California Highway Patrol officer Larry Vicino said.
The vehicle then struck the guardrail and overturned, landing on its side, trapping two occupants — the driver and passenger, Vicino said.
The female passenger had to be extricated from he wreckage and was transported by ground ambulance to a local hospital with serious injuries.
The driver suffered injuries described as minor and was also transported by ambulance to an area hospital.
CHP issued a SigAlert at 10:12 a.m. as rescue crews worked to free the victims and later clear the lanes.
All the lanes were blocked.
Efforts to restore the morning commute were hampered by the fact that the incident occurred near a bridge without shoulder space, making it difficult to divert traffic, Vicino said.
No other injuries were reported.
The roadway was opened at 10:40 a.m.
*Joe Fanaselle contributed to this report.