The following information is known about the road closure:
- The M4 westbound in Berkshire is closed between J10 Winnersh Interchange and J11 Three Mile Cross Interchange
- The road is closed on Tuesday, February 17, before rush-hour traffic
- The closure is due to a serious collision
- Thames Valley Police and leading the incident response
- South Central Ambulance Service and National Highways traffic officers are at the scene
