SINGLE COUNTYWIDE HIGHWAY DISTRICTS – Amends, repeals, and adds to existing law to revise provisions regarding the election of commissioners in certain single countywide highway districts.

This bill revises election rules for highway district commissioners in Idaho counties with over 200,000 residents. It requires dividing such counties into five equal population subdistricts (with no precincts split), mandating commissioners be residents of their assigned subdistrict. The bill changes ballot rules to require plurality voting (not majority) for commissioner elections and adds primary elections starting in 2028. These changes apply to commissioners in single countywide highway districts, affecting voters and candidates in those specific districts.