11580.9. (a) Where two or more policies affording valid and
collectible automobile liability insurance apply to the same motor
vehicle in an occurrence out of which a liability loss shall arise,
and one policy affords coverage to a named insured engaged in the
business of selling, repairing, servicing, delivering, testing,
road-testing, parking, or storing motor vehicles, then both of the
following shall be conclusively presumed:
(1) If, at the time of loss, the motor vehicle is being operated
by any person engaged in any of these businesses, or by his or her
employee or agent, the insurance afforded by the policy issued to the
person engaged in the business shall be primary, and the insurance
afforded by any other policy shall be excess.
(2) If, at the time of loss, the motor vehicle is being operated
by any person other than as described in paragraph (1), the insurance
afforded by the policy issued to any person engaged in any of these
businesses shall be excess over all other insurance available to the
operator as a named insured or otherwise.
(b) Where two or more policies apply to the same loss, and one
policy affords coverage to a named insured engaged in the business of
renting or leasing motor vehicles without operators, it shall be
conclusively presumed that the insurance afforded by that policy to a
person other than the named insured or his or her agent or employee,
shall be excess over and not concurrent with, any other valid and
collectible insurance applicable to the same loss covering the person
as a named insured or as an additional insured under a policy with
limits at least equal to the financial responsibility requirements
specified in Section 16056 of the Vehicle Code. The presumption
provided by this subdivision shall apply only if, at the time of the
loss, the involved motor vehicle either:
(1) Qualifies as a "commercial vehicle." For purposes of this
subdivision, "commercial vehicle" means a type of vehicle subject to
registration or identification under the laws of this state and is
one of the following:
(A) Used or maintained for the transportation of persons for hire,
compensation, or profit.
(B) Designed, used, or maintained primarily for the transportation
of property.
(2) Has been leased for a term of six months or longer.
(c) Where two or more policies are applicable to the same loss
arising out of the loading or unloading of a motor vehicle, and one
or more of the policies is issued to the owner, tenant, or lessee of
the premises on which the loading or unloading occurs, it shall be
conclusively presumed that the insurance afforded by the policy
covering the motor vehicle shall not be primary, notwithstanding
anything to the contrary in any endorsement required by law to be
placed on the policy, but shall be excess over all other valid and
collectible insurance applicable to the same loss with limits up to
the financial responsibility requirements specified in Section 16056
of the Vehicle Code. In that event, the two or more policies shall
not be construed as providing concurrent coverage, and only the
insurance afforded by the policy or policies covering the premises on
which the loading or unloading occurs shall be primary and the
policy or policies shall cover as an additional insured with respect
to the loading or unloading operations all employees of the owner,
tenant, or lessee while acting in the course and scope of their
employment.
(d) Except as provided in subdivisions (a), (b), and (c), where
two or more policies affording valid and collectible liability
insurance apply to the same motor vehicle or vehicles in an
occurrence out of which a liability loss shall arise, it shall be
conclusively presumed that the insurance afforded by that policy in
which the motor vehicle is described or rated as an owned automobile
shall be primary and the insurance afforded by any other policy or
policies shall be excess.