(1) A relevant road manager may give consent to the grant of a mass or dimension authority for a trial period of no more than 3 months specified by the road manager.
(2) The trial period determines the maximum period for which the mass or dimension authority applies.
(3) If there is more than one relevant road manager in relation to a proposed mass or dimension authority, the consent of one or more of the road managers is ineffective unless all the road managers give their consent to the same effect.