CA Gov't Code Section 69894.4

All of the employees provided for in Section 69894.1 and judges of the superior court in each county having a population of over 2,000,000 shall be allowed actual traveling and necessary expenses incurred while engaged in the duties of their office, which shall be the same as allowed to officers and employees of such county. Any expenses for travel outside of the county shall require the prior approval of the board of supervisors. Whenever, because of the nature of the duties of any judge or officer of the court, the board of supervisors determines that the best interest of the county and the court would be served, it may assign an automobile in lieu of allowing travel expenses. The salaries provided for in said Section 69894.1 shall be paid by the county out of such fund as other salary demands against the county are paid. The expenses provided for in this section shall be paid in monthly installments out of the general fund. Salaries and expenses shall be audited in the same manner as the law requires for other demands against the county.