(1) Regional transportation authorities in major metropolitan areas of the state may be established as 1 or more contiguous counties elect by majority vote of the county boards of commissioners to establish or participate in an authority.

    (2) A county which becomes a part of an authority created under this act may withdraw from the authority within 1 year after the county becomes a part of the authority by a resolution of withdrawal approved by a majority vote of the members elected to and serving on its county board of commissioners or may withdraw at any time after 1 year after the county becomes a part of the authority by a resolution of withdrawal approved by a 2/3 vote of the members elected to and serving on its county board of commissioners. However, if the county has an elected county executive pursuant to Act No. 139 of the Public Acts of 1973, as amended, being sections 45.551 to 45.573 of the Michigan Compiled Laws, the county executive may veto the resolution. A veto may be overridden by a 2/3 vote of the members elected to and serving on the county board of commissioners.