Cal. Veh. Code § 12812

If a driver with a class C or M license, who is not required to have a certificate under any provision of this code, is presumed to be a negligent operator pursuant to Section 12810.5, the department may, as a condition of probation, issue a restricted driver’s license to permit driving of a vehicle while in the course of the driver’s employment during specified hours of employment or any other restrictions as determined by the department. The restrictions shall be noted on the driver’s license.