As a result, vehicles were diverted via the Prince of Wales Bridge, causing increased traffic in the area. The M48 Severn Bridge closure forms part of longer-term maintenance works, and a single lane contraflow system will be in place until September 18 and one lane open in each direction. A spokesperson for The Severn Bridges said: "M48 Severn Bridge closed 8pm tonight, August 7, to 8pm tomorrow, August 8, for contraflow setup ahead of resurfacing works. Delays eased later in the afternoon, with movement improving to around 20mph, though motorists were advised to allow extra time for their journeys. Drivers are advised to allow extra time for their journeys.