Except when authorized in writing by the City Clerk, no peddler, solicitor or canvasser or any other person shall have exclusive right to any location in the public streets for the purpose of selling or soliciting sales, nor shall any person be permitted a stationary location in the public streets, nor shall any person be permitted to operate in the sidewalks and streets within the fire limits of the city or any congested area where his or her operations might impede or inconvenience the public.