(1) Tariffs. Except as authorized by the commission pursuant to WAC 480-30-420, no auto transportation company may assess rates that are higher, lower, or different from those contained in the company's filed tariff. Further, no auto transportation company may accept a payment for service provided that is higher, lower, or different from the rates contained in the company's filed tariff.

(2) Time schedules. An auto transportation company must provide service along all routes, and to all points, listed on the company's filed time schedule. Further, an auto transportation company must make a good faith effort to operate in compliance with the times of arrival and/or departure shown on the company's filed time schedule.