 When the M40 motorway was opened, the A423 and the A4130 both lost trunk road status because the route from Maidenhead to the Coventry was transferred onto the M40.That part of the A423 was renumbered A4130.In 1993 the Wallingford By-pass was opened, and the A4130 was diverted to follow the new road, crossing the River Thames by the new Winterbrook Bridge instead of Wallingford Bridge.