(a) Any county road or city street within the corporate limits of the city.
(b) Any road without such city, if it has a population of less than 100,000, but leading directly to it.
(2) In the agreements the parties shall agree upon the proportion which each shall contribute toward such acquisition, construction, improvement or repair and upon the method and kind of acquisition, construction, improvement or repair to be made. [Amended by 1955 c.388 §1]