A woman is dead after the car she was driving rammed through a guard rail on a downtown overpass and plunged onto the 110 Freeway, prompting the closure of northbound lanes Thursday morning.

The car did not fall on any other vehicles when it plummeted from the 3rd Street overpass, but at least one automobile collided with the fallen car, officials said.

The closure of northbound lanes lasted roughly four hours. The California Highway Patrol canceled the SigAlert at 8:20 a.m.

The dead motorist was described by Los Angeles Fire Department spokeswoman Margaret Stewart as a woman about 50 years old. No one else was injured.


CHP issued a SigAlert at 4:18 a.m., shutting down the northbound 110 near 3rd Street. By 6:50 a.m., the outside lane was moving, but all other lanes on the main portion of the northbound 110 remained blocked, CHP public information officer Juan Galvan said.

He estimated it would take about two hours for all lanes to reopen. Traffic on the northbound 110 was slow starting at Vernon Avenue, he said. The westbound 10 Freeway also was tight near the 110 connector.

Galvan said the cause of the incident was under investigation.

maya.lau@latimes.com


Marc Olson contributed to this report.

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UPDATES:

8:45 a.m.: This article was updated to reflect the cancelation of the SigAlert.

7:10 a.m.: This article was updated with staff reporting.


This article was originally published at 5:45 a.m.