Authorised vehicles can pass these signs if it is a permitted class to do so, the types of vehicle permitted to enter will always be shown by additional signage
Gall cerbydau ag awdurdod basio’r arwyddion hyn os ydynt mewn dosbarth â chaniatâd i wneud hynny, bydd mathau’r cerbydau sydd â chaniatâd i fynd i mewn wedi’u dangos ar arwyddion ychwanegol (h.y.