When applications are based upon special circumstances and conditions, or upon rules, regulations, rates or ratings applying in other localities or territories, or applicable over the lines of other carriers, full information respecting these special circumstances and conditions or existing rules, regulations, rates or ratings shall be given.
52 Pa. Code § 23.103
The provisions of this §23.103 amended under the Public Utility Code, 66 Pa.C.S. § 501.