K.S.A. 12-685

The governing body of any city is hereby authorized and empowered to designate and establish, by ordinance as a main trafficway any existing or proposed street, boulevard, avenue or part thereof, within such city, the primary function of which is, or shall be, the movement of through traffic between areas of concentrated activity within the city or between such areas within the city and traffic facilities outside the city performing the function of a major trafficway. Such designation by the governing body shall be final and conclusive.