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MCS-90 endorsement

An endorsement that must be attached to the auto liability policy of certain regulated motor carriers to ensure that federally mandated coverage (e.g., required liability limits and environmental restitution coverage) is in place. The endorsement does not actually provide insurance except on a reimbursement basis. For example, a standard unendorsed Insurance Services Office, Inc. (ISO), commercial auto policy contains a pollution exclusion that would preclude coverage for environmental restitution. In the event the broadened pollution liability coverage endorsement (CA 99 48) is attached to a regulated motor carrier's policy, the pollution exclusion is modified but not totally deleted. In either event, if the MCS-90 endorsement is attached, the insurer's obligation with respect to such a situation is determined by the MCS-90 endorsement provisions regardless. If the policy would provide such coverage even without that endorsement, the insurer pays the claim and the endorsement effectively has no impact on the issue. However, if the claim would not have been covered under the policy except for the MCS-90 endorsement provisions, the insurer pays the claim and then has the right to seek reimbursement from the insured. See also Motor Carrier Act (MCA) of 1980; Motor carrier policy.

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