In late 2005 , Livingstone proposed large fare increases for on-the-spot tickets across the Tube and bus network to encourage regular travellers to use the automated Oyster system to reduce queuing at Underground stations and avoid delays in conductorless buses as drivers issue tickets . In late 2005 , Livingstone proposed large fare increases for on-the-spot tickets across the Tube and bus network to encourage regular travellers to use the automated Oyster system , to reduce queuing at Underground stations and to avoid delays in conductorless buses as drivers issue tickets .