113 of Chapter 175 of the General Laws is hereby amended to strike the second and third sentences in paragraph 5 and to substitute therefore, the following:

       An insured who is not a named insured on any policy providing uninsured motorist coverage may recover only from the policy of a resident relative or of anyone living in his or her household upon whose policy he or she is listed as a regular operator providing the highest limits of such coverage whether or not such vehicle was involved in the accident; provided, however, if there are two or more such policies which provide such coverage at the same limits a pro rata contribution will be made.  Any injured occupants who are not named insureds on a policy and who are not insured on a resident relative’s policy or are not listed as a regular operator on a policy of someone living in his or her household may obtain underinsured motorist coverage from the named insured’s policy covering the vehicle they occupy when injured.