California Code, Streets and Highways Code - SHC § 1168.9

(a) The board may order two or more divisions consolidated if the board finds that their boundaries are contiguous at any point or that a consolidated program of construction, improvement, or maintenance will reduce the costs of or increase the efficiency of providing highway construction, improvement, or maintenance.

(b) Property within a division proposed to be consolidated with another division and in which bonds are not outstanding for work performed pursuant to this article shall not be deemed to be property in the division for the purpose of Section 1184 as it applies to the consolidated division.