When used in this article, the following words and phrases shall have the following meanings, respectively, unless the context clearly indicates otherwise:
(1) STREET IMPROVEMENTS. Filling, grading, leveling, graveling, slagging, cherting, macadamizing, paving, draining, or otherwise improving any street, avenue, alley, highway, or other public place, including the construction of sidewalks, curbs, and gutters.
(2) SEWER IMPROVEMENTS. Storm water sewers and storm water sewer systems and sanitary sewers, sanitary sewer systems, sewage treatment plants and sewage disposal plants, and all appurtenances to any such sewers or plants.
(3) PUBLIC IMPROVEMENTS. Street improvements and sewer improvements or either of them.
(4) POLICE JURISDICTION. The territory lying outside the corporate limits of a city but within its police jurisdiction.