They do not have roof signage but can be distinguished by a rectangular yellow licence plate to the rear bumper and a round yellow sticker to each front door.
Nid oes ganddynt arwyddion ar y to ond gellir eu hadnabod wrth blât trwyddedu melyn hirsgwar ar y bympar ôl a sticer melyn crwn ar y ddau ddrws blaen.