What is the test for a narrowly tailored restriction on speech in the context of Section 403 of the Civil Code of Civil Procedure?

A content-neutral time, place, or manner restriction on speech is narrowly tailored if it does not burden substantially more speech than is necessary to achieve a substantial government interest.... [T]he existence of obvious, less burdensome alternatives is a relevant consideration in determining whether the fit between ends and means is reasonable. Berger v. City of Seattle, 569 F.3d 1029, 1041 (9th Cir.2009) (internal citations, quotation marks, and modifications omitted). CPR argues that 403 is not narrowly tailored because it applies to expressive conduct, no matter how momentary, and sweeps within its breadth large amounts of protected speech.