Streets and Highways Code § 27108

The judgment shall only be subject to review by the Supreme Court of this State, upon a writ of review issued out of that court in such cases as writs of review are now permissible against superior courts.

Proceedings for a writ of review may only be taken within 10 days after the entry of the judgment in the superior court and if not so taken all such judgments of the superior court shall become final.