SINGLE COUNTYWIDE HIGHWAY DISTRICTS – Amends 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 populations over 200,000. It requires dividing such counties into five population-based subdistricts, with commissioners elected from each subdistrict to represent residents there. Future commissioners will serve four-year terms (with some initial two-year terms in 1998), and primary elections will be required starting in 2026. This directly affects voters and candidates in those specific countywide highway districts.