Neb. Rev. Stat. §§ 14-394
A city is authorized to change the grade of any street, highway, boulevard, main thoroughfare, controlled-access facility, connecting link, major traffic street, alley, or part of such street, highway, boulevard, thoroughfare, facility, link, or alley when a petition for a proper and satisfactory change of grade has been signed and filed by the record owners of a majority of the frontage of taxable property abutting upon that part of the street of which the change of grade is proposed. A petition for the order changing the grade may include the change of grade of any number of intersecting or connecting streets which may be reasonably appropriate and necessary to a proper adjustment of grades. In such event the sufficiency of the petition shall be determined by a consideration of the total frontage feet of taxable property upon all the streets or parts of such streets upon which it is proposed to change the grades.
Neb. Rev. Stat. §§ 14-394