The Red Bridge in Tasmania crosses the Elizabeth River at Campbell Town. Built in 1838 using penal labour, it is the oldest surviving brick arch bridge in Australia, as well as the oldest bridge anywhere on the National Highway. The bridge contains three arch spans of 7.6 m (25 ft) each and holds two lanes of traffic as well as pedestrian walkways. It lies on the Midland Highway, roughly halfway between Hobart and Launceston, carrying over two million vehicles per year. The Red Bridge is registered on the Register of the National Estate since 1978.