If a portion of an existing street or highway constitutes any portion of the boundary of the division of land and such street or highway is unimproved, or the city council determines that the improvements are insufficient for the general use of the lot owners in the division of land and for local neighborhood traffic and drainage needs, the city council may require the subdivider to improve or agree to improve such street or highway as specified in Sections 11.28.050, 11.28.060 and 11.28.170.
(Ord. 537 § 2 (part), 1985)