W. Va. Code § 24A-3-5
Every contract carrier by motor vehicle is hereby forbidden to give or cause any undue or unreasonable advantage or preference to those whom it serves as compared with the patrons of any common carrier by motor vehicle as that term is used in this chapter, or the patrons of any other common carrier, or to subject the patrons of any such common carriers to any undue or unreasonable discrimination or disadvantage; or by unfair competition to destroy or impair the service or business of any common carrier by motor vehicle, or of any other common carrier, or the integrity of the state's regulation of any such service or business; and, to the end that the said commission may enforce these provisions, each such contract carrier by motor vehicle shall maintain on file with the commission a statement of its charges, and of such other matters as the commission may require.
W. Va. Code § 24A-3-5