California Code, Vehicle Code - VEH § 17300

(a) A person who willfully or negligently damages a street or highway, or its appurtenances, including, but not limited to, guardrails, signs, traffic signals, snow poles, and similar facilities, is liable for the reasonable cost of repair or replacement thereof.

(b) A person who willfully damages or destroys a memorial sign placed by the Department of Transportation, including, but not limited to, a sign memorializing a victim under Section 101.10 of the Streets and Highways Code, is liable for that damage or destruction for the highest of the following amounts:

(c) A person who willfully or negligently causes or permits the contents of a vehicle to be deposited upon a street or highway, or its appurtenances, is liable for the reasonable costs of removing those contents from the street or highway or its appurtenances.

(d) The liability stated in this section also applies to an owner of a vehicle operated with the owner's permission, as provided in Article 2 (commencing with Section 17150), and includes liability for the reasonable cost of necessary safety precautions, including, but not limited to, warning traffic, the removal of debris resulting from accidents, the removal of any materials, or providing detours.

(e) The Department of Transportation and local authorities, with respect to highways under their respective jurisdictions, may present claims for liability under this section, bring actions for recovery thereon, and settle and compromise, in their discretion, claims arising under this section.

(f) If the Department of Transportation or a local authority provides services on a highway outside its jurisdiction, at the request of the department or the local authority that has jurisdiction over that highway, the department or the local authority may present a claim for liability for rendering this service under this section, bring actions for recovery thereon, and, in its discretion, settle and compromise the claim.