New public thoroughfares hereafter constructed in the city (including those in platted subdivisions where names are suggested by the subdivider and recommended by the City Planning Commission) shall be assigned names or numbers in accordance with §§ 12.04.030 and 12.04.040, and except names of new thoroughfares, which are shown in a subdivision plat approved by the Planning Commission, all new thoroughfare names shall be designated by resolution of the City Council after considering the recommendations of the Planning Commission.