Traffic is being held on the #M3 westbound between J10 and J11 due to a single vehicle collision. There are currently 1.5 miles of congestion. Post navigation Man arrested at Windsor Castle detained under Mental Health Act Update from scene, @HantsPolRoads advise that traffic has been released in 2 lanes (the right hand ones). The west/southbound exit slip-road at J11 and the left lane of the main carriageway will remain closed whilst emergency services continue to work at scene.