A mayoral election is about to be held in Bay City. One of the candidates is Donita Estrella, and her supporters wish to post campaign signs on streetlights and utility posts. A Bay City ordinance prohibits the posting of signs on public property. The purpose of the ordinance is to improve the appearance of the city. Estrella’s supporters contend that the ordinance violates their rights to free speech. What factors might a court consider in determining the constitutionality of this ordinance?