The M4 relief road, also known as M4 Corridor around Newport (M4CaN), was a proposed motorway, south of the city of Newport, South Wales, intended to relieve traffic congestion on the M4 motorway. Originally proposed by the Welsh Office in 1991, it was not pursued by the Conservative Major Government. Following devolution in 1999 the project was again drawn up by Welsh Government economic and transport minister Andrew Davies in 2004 but this was withdrawn in 2009 when the cost estimates had risen by £660m, to a total of £1 billion.