Nothing contained in sections 238.02, subdivisions 3a, 20a, and 31b, and 238.37 to 238.42 in any way prohibits a public utility company from including in its pole, duct, and conduit agreements with cable communications systems additional terms which do not conflict with sections 238.02, subdivisions 3a, 20a, and 31b, and 238.37 to 238.42.