The bus from Waterford to Cork stops at Davitts Quay in Dungarvan. To avail of an €18 return trip to Cork, maybe the passenger has to get off and wait for the next bus.
I expect that the many people in Sales, Marketing, Ad Production and Proof Reading in Bus Éireann all knew that the Dungarvan tickets were cheaper and that the message on the back of the bus is correct.
With so many involved, it could never be a mistake, could it?