California Code, Vehicle Code - VEH § 27503

(a) The commissioner, after public hearings, shall adopt regulations setting noise standards for pneumatic tires.  Such standards shall be the lowest level of noise consistent with economic and technological feasibility and with public safety as stated in the regulations adopted pursuant to Section 27500.  Such standards may be adopted for each tire-vehicle type combination.  The regulations may require the manufacturer to prove to the commissioner that the tire meets the standards, subject to such inspection as the commissioner prescribes.  The regulations shall be filed with the Legislature eight months after the federal study on tire noise is available, and shall become operative one year after such filing.

(b) It is the intent of the Legislature in enacting this section that the commissioner shall consider recommendations of the United States Department of Transportation before developing independent standards for tire noise.