(a) The department may not by rule restrict competitive bidding or advertising by a motor carrier except to prohibit false, misleading, or deceptive practices.
(b) A rule to prohibit false, misleading, or deceptive practices may not:
(1) restrict the use of:
(A) any medium for an advertisement;
(B) a motor carrier's advertisement under a trade name; or
(C) a motor carrier's personal appearance or voice in an advertisement, if the motor carrier is an individual; or
(2) relate to the size or duration of an advertisement by a motor carrier.