Do children aged 6-14 have to be indicated on the ticket?

Children aged 6 to 14 travel free of charge when accompanied by passengers aged 15 and over, but must be indicated when booking. Up to four children can travel on each ticket. It is not possible to add children on the adult's ticket once the journey has started.

If you are only using local transport, it is generally possible to take up to three children with you free of charge. Regional and transport association tariffs may deviate from this rule.