The easiest solution is to report the accident to your insurer and let it conduct an investigation into fault.
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Contact your insurance company. The company is responsible for creating the obstruction in the roadway. You'd have to show it created an unavoidable wreck or you couldn't have avoided it. It sounds like an error.
Unless you have some uncompensated damages, like injury to your person, or out of pocket expenses like a rental vehicle, I would go to the CHP and politely ask to give a supplemental report. Then report to accident to your insurance company.
If you have some uncompensated damages, then you should consult with a personal I jury lawyer in the county of the accident.
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