324.Sections 191 and 192 provide for the preparation and publication of the guidance document. It must first be prepared in draft and the local authorities affected, the police, the Traffic Commissioners affected, the London Transport Users' Committee and anyone else the Mayor thinks fit must be consulted. It must be published not later than 180 days from the date of publication of the Mayor's transport strategy and be made available to the public. Similar provision is made for the preparation and publication of revisions to the document.