(a) No reduction shall be made in any charge of a contract carrier by motor vehicle either directly or by means of any change in any rate, rule, or practice affecting the charge or the value of services thereunder except after thirty (30) days' notice of the proposed change filed in the manner and form set forth in § 23-13-245. However, in its discretion and for good cause shown, the Arkansas Department of Transportation may allow such a change upon less notice or modify the requirements of § 23-13-245 with respect to posting and filing of the schedules, either in particular instances or by general order applicable to special or peculiar circumstances or conditions.
(b) The notice shall plainly state the change proposed to be made and the time when the change will take effect.