Neb. Rev. Stat. § 14-1734

Before the issuance of any revenue bonds for improvements as provided under section 14-1733 , a city of the metropolitan class shall have an independent and qualified firm of engineers prepare plans and specifications for the improvements financed with such bonds. In the preparation of such plans and specifications, the independent engineer shall collaborate and counsel with any city engineering or traffic department so as to coordinate the program with the program for the control of traffic within such city.