Perhaps the greatest challenge for a visitor to Boise is comprehending the city's obsession with one-way streets in the downtown core. But if Ada County Highway District planners have their way, big changes are in store: Proposals include conversion of Third, Fourth, a section of Eighth, 11th, 12th and 14th streets into two-ways. Perhaps the biggest proposed change would see Jefferson Street become a two-way thoroughfare. The plan includes introduction of separately designated bike lanes in each direction. Another big change would be the introduction of so-called "mini-roundabouts," designed for intersections with less commercial traffic on Third, Grove and Bannock streets. But plans this dramatic will require buy-in from ACHD commissioners and officials at Boise City Hall.