The route can be of any total length, as long as throughout its length passengers can get off within 24.15 kilometres (15 miles) (measured in a straight line) of the place where they were picked up.
Gall y daith fod o unrhyw hyd, cyn belled â bod modd i deithwyr fynd oddi ar y bysiau o fewn 24.15 cilometr (15 milltir) (wedi’i fesur mewn llinell syth) i ble y cawsant eu codi.