California Code, Streets and Highways Code - SHC § 33137

Bonds issued under this part may be serial or sinking fund bonds.  A bond by its terms shall not mature more than forty (40) years from its own date.  If any authorized issue is divided into two or more series or divisions, the maximum maturity date shall be calculated from the date on the face of each bond separately, irrespective of the fact that different dates may be prescribed for the bonds of each separate series or division of any authorized issue.