The Group Day Ticket is valid for up to 5 adults aged 15 years and older for an unlimited number of trips within the selceted area of validity. The ticket is valid until 6 am the following day. The Group Day Ticket for three days is valid on three consecutive days until 6 am on the fourth day. Information: Two children between the age of 6 and 14 count as one adult. During school trips students count as children including grade 9.