In Britannia, as in other provinces, the Romans constructed a network of paved trunk roads to (surfaced highways). In their nearly four centuries of occupation (43 – 410 AD) they built about 2,000 miles of Roman roads in Britain. They are shown on the Ordnance Survey's "Map of Roman Britain". This is the most accurate and up-to-date layout of certain and probable routes that is available to the general public.