"The individual has been safely detained and is being taken to a local hospital for evaluation," the CHP said on social media.
The two left-hand lanes had been blocked around 9:41 a.m. to accommodate an emergency response, according to the CHP.
The affected lanes have reopened, the CHP said.
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The San Francisco Police Department and the San Francisco Fire Department assisted during the incident.
You can check the latest ABC7 traffic conditions in the San Francisco Bay Area here.