Regional bus map dated May 1, 1976. The map was created to guide transit users during construction of the downtown Portland bus mall on SW 5th and 6th avenues. A panel labelled Map No. 3 shows the downtown core, with the new bus mall highlighted. A note explains that during construction on SW 5th Ave., all buses ran on SW 6th Ave. Four icons are shown, to help riders identify their bus stop: street lamp, horsecar, hard hat and green tree.