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 @Capt_tuBBymAN @HantsPolice Thank you for your tweet Rich. Closing the entry slip-road 2 junctions back would take some time to arrange given that our traffic officers in the area are currently on scene with the collision at J11. We will get you moving as soon as possible.