California Code, Vehicle Code – VEH § 12501

12501.  The following persons are not required to obtain a driver’s license:
(a) An officer or employee of the United States, while operating a motor vehicle owned or controlled by the United States on the business of the United States, except when the motor vehicle being operated is a commercial motor vehicle, as defined in Section 15210.

California Code, Vehicle Code – VEH § 15210

15210.  Notwithstanding any other provision of this code, as used in
this chapter:
   (a) "Commercial driver's license" means a driver's license issued
by a state or other jurisdiction, in accordance with the standards
contained in Part 383 of Title 49 of the Code of Federal Regulations,
which authorizes the licenseholder to operate a class or type of
commercial motor vehicle.
   (b) (1) "Commercial motor vehicle" means any vehicle or
combination of vehicles which requires a class A or class B license,
or a class C license with an endorsement issued pursuant to paragraph
(4) of subdivision (a) of Section 15278.
   (2) "Commercial motor vehicle" does not include any of the
following:
   (A) A recreational vehicle**, as defined in Section 799.24 of the
Civil Code.
   (B) Military equipment operated by noncivilian personnel, which is
owned or operated by the United States Department of Defense,
including the National Guard, as provided in Parts 383 and 391 of
Title 49 of the Code of Federal Regulations.
   (C) An implement of husbandry operated by a person who is not
required to obtain a driver's license under this code.
   (D) Vehicles operated by persons exempted pursuant to Section
25163 of the Health and Safety Code or a vehicle operated in an
emergency situation at the direction of a peace officer pursuant to
Section 2800.
   (c) "Controlled substance" has the same meaning as defined by the
federal Controlled Substances Act (21 U.S.C. Sec. 802).
   (d) "Disqualification" means a prohibition against driving a
commercial motor vehicle.
   (e) "Employer" means any person, including the United States, a
state, or political subdivision of a state, who owns or leases a
commercial motor vehicle or assigns drivers to operate such a
vehicle.  A person who employs himself or herself as a commercial
vehicle driver is considered to be both an employer and a driver for
purposes of this chapter.
   (f) "Felony" means an offense under state or federal law that is
punishable  by death or imprisonment for a term exceeding one year.
   (g) "Gross combination weight rating" means the value specified by
the manufacturer as the maximum loaded weight of a combination or
articulated vehicle.  In the absence of a value specified by the
manufacturer, gross vehicle weight rating will be determined by
adding the gross vehicle weight rating of the power unit and the
total weight of the towed units and any load thereon.
   (h) "Gross vehicle weight rating" means the value specified by the
manufacturer as the maximum loaded weight of a single vehicle, as
defined in Section 390.
   (i) "Serious traffic violation" includes either of the following:

   (1) Excessive speeding, as defined pursuant to the federal
Commercial Motor Vehicle Safety Act (P.L. 99-570).
   (2) Reckless driving, as defined pursuant to the federal
Commercial Motor Vehicle Safety Act (P.L. 99-570).
   (3) A violation of any state or local law involving the safe
operation of a motor vehicle, arising in connection with a fatal
traffic accident.
   (4) Any other similar violation of a state or local law involving
the safe operation of a motor vehicle,  as defined pursuant to the
Commercial Motor Vehicle Safety Act (Title XII of P.L. 99-570).
   In the absence of a federal definition, existing definitions under
this code shall apply.
   (j) "State" means a state of the United States or the District of
Columbia.
   (k) "Tank vehicle" means any commercial motor vehicle that is
designed to transport any liquid or gaseous material within a tank
that is permanently or temporarily attached to the vehicle or the
chassis, including, but not limited to, cargo tanks and portable
tanks, as defined in Part 171 of Title 49 of the Code of Federal
Regulations.  This definition does not include portable tanks having
a  rated capacity under 1,000 gallons.
>>
California / Civil Code - CIV / ARTICLE 1. Definitions [799.20. - 799.32.] / Section 799.29. 

Section 799.29. (Repealed and added by Stats. 1992, Ch. 310, Sec. 2.)
Cite as: Cal. Civil Code §799.29.

“Recreational vehicle**” has the same meaning as defined in Section 18010 of the Health and Safety Code.

>

CHAPTER 1. Definitions [18000 – 18014.5]

  ( Chapter 1 added by Stats. 1981, Ch. 975, Sec. 3. )

18010.  

“Recreational vehicle**” means both of the following:

(a)  A motorhome, travel trailer, truck camper, or camping trailer, with or without motive power, designed for human habitation for recreational, emergency, or other occupancy, that meets all of the following criteria:

(1)  It contains less than 320 square feet of internal living room area, excluding built-in equipment, including, but not limited to, wardrobe, closets, cabinets, kitchen units or fixtures, and bath or toilet rooms. (Comment by Hansen > Any car qualifies.)

(2)  It contains 400 square feet or less of gross area measured at maximum horizontal projections.

(3)  It is built on a single chassis.

(4)  It is either self-propelled, truck-mounted, or permanently towable on the highways without a permit.

(b)  A park trailer, as defined in Section 18009.3.

>

Conclution in my (Hansen’s) oppinion: Just as privite people need not have a license, it is the same for any state employee, that unless they are ingaged in a regulatable activity, nether are required to be governed except by common law, thus no state license regulation is applicable. PJH 2-2018