(a) The base toll rate for vehicles crossing the state-owned toll bridges within the geographic jurisdiction of the commission as of January 1, 2003, is as follows:

(b) If the voters approve a toll increase, pursuant to Section 30921, commencing July 1, 2004, the base toll rate for vehicles crossing the bridges described in subdivision (a) is as follows:

(c)

1. (1) If the voters approve a toll increase, pursuant to Section 30923, the authority shall increase the base toll rate for vehicles crossing the bridges described in subdivision (a) from the toll rates then in effect by the amount approved by the voters pursuant to Section 30923. The authority may, beginning six months after the election approving the toll increase, phase in the toll increase over a period of time and may adjust the toll increase for inflation based on the California Consumer Price Index after the toll increase has been phased in completely.

2. (2) Revenue generated from the adjustment of the toll to account for inflation pursuant to paragraph (1) may be expended for the following purposes:

   1. (A) Bridge maintenance and rehabilitation necessary to preserve, protect, and replace the bridge structures consistent with subdivision (b) of Section 30950.3.
   2. (B) Supplemental funding for the projects and programs authorized pursuant to subdivision (a) of Section 30914.7.