For purposes of this section, a "grandfathered political subdivision" is any political subdivision which has, prior to May 1, 2001, enacted one or more ordinances reflecting a policy of imposing any linear foot fees on any public utility right-of-way user, including ordinances which were specific to particular public right-of-way users. Any existing ordinance or new ordinance passed by a grandfathered political subdivision providing for payment of the greater of a linear foot fee or a gross receipts tax shall be enforceable only with respect to the linear foot fee.
§ 67.1846, RSMo