The Lights Are On: Plaintiffs’ CEQA Challenge Against Bay Bridge Light Art Installation Barred by the Doctrine of Issue Preclusion

In Baker v. Bay Area Toll Authority, No. A174642 (1st Dist, June 5, 2026), the court affirmed the dismissal of a CEQA challenge against the Bay Area Toll Authority’s approval of the Bay Lights 360 project, an LED light art installation on the San Francisco Bay Bridge. 

The trial court dismissed a previous CEQA challenge against the Toll Authority’s use of a categorial exemption to approve the project, based on the court’s finding that the challenge was untimely under CEQA’s statute of limitations. The plaintiff did not appeal that ruling. The plaintiff then brought a second CEQA challenge against a safety study to test the lighting, as approved in a Caltrans encroachment permit issued to the Toll Authority, asserting that this was a stand-alone project under CEQA that itself had the potential to cause significant environmental effects. The trial court again dismissed the plaintiffs’ challenge, on the ground that its prior dismissal of the first case precluded the plaintiffs’ new claim.  The court of appeal affirmed.

In the published portion of the opinion, the court of appeal agreed with the trial court that the plaintiff was precluded from raising the same arguments that were litigated in the first CEQA action.  The court explained that the doctrine of “issue preclusion,” which has ancient roots, serves “to ensure that a dispute resolved in one case is not relitigated in a later case.”  This doctrine applies to (1) a final adjudication (2) of an identical issue (3) actually litigated and decided in the first suit and (4) asserted against a party in the first suit (or one in privity with that party). 

As to the fourth prong, there was no dispute that the parties were the same in both cases.  As to the second and third prongs, the court readily determined that the plaintiffs’ arguments as to why CEQA’s statute of limitations did not apply were identical in both cases and that these arguments were actually litigated and decided in the first case. 

The court then turned to the first prong, and the question of whether a final adjudication in the first case needed to be “on the merits” to have a preclusive effect in the second challenge.  The court stated that it did not need to resolve this question, deciding that – even if this test did apply – it was satisfied in this case.  After a review of the case law, the court determined that the “on the merits” test is met where the facts alleged in the first case failed to establish a cause of action and the same facts are pleaded in the second case.  As that was the case here, the plaintiffs’ second CEQA challenge was barred by the doctrine of issue preclusion. 

The court also emphasized the public policy concerns underlying its ruling, including preservation of the integrity of the judicial system, promotion of judicial economy, protection of litigants from harassment by vexatious litigation, and the important role played by the availability of appellate review, which the plaintiff forfeited by not appealing the trial court’s dismissal of his first CEQA action. 

Finally, in the unpublished portion of the opinion, the court of appeal explained that a project under CEQA is “the whole of an action,” and that the plaintiff “fails to allege or explain to how operating the lights for purposes of an initial safety study or coordinating with different agencies to install and operate the project are anything other than steps in a coordinated endeavor to implement the project.”  Put another way: “The trial court correctly determined that the encroachment permit and the safety study it describes are components of the overall Bay Lights 360 project, and do not constitute a new project or a substantial change to the project under CEQA.”