(1) In this section-

"authorisation" means an authorisation under subsection (2) to establish a checkpoint;

"checkpoint" means a checkpoint established under an authorisation.

(2) A member of the Garda Síochána, not below the rank of inspector, may, for the purposes of section 4 authorise the establishment of a checkpoint or checkpoints in a public place or places at which members of the Garda Síochána may exercise the powers under subsection (4).

(3) An authorisation shall be in writing and shall specify -

(a) the date on which, and the public place in which, the checkpoint is to be established, and

(b) the hours at any time between which it may be operated.

(4) A member of the Garda Síochána, who is on duty at a checkpoint, may stop any vehicle at the checkpoint and, without prejudice to any other powers (including the functions under section 9) conferred on him or her by statute or at common law, may require a person in charge of the vehicle to do one or more of the following: