PART of the M4 is closed in both directions due to a serious crash which involved two vehicles.

National Highways was alerted about the crash, which took place on the eastbound carriageway between junctions 22 (M49) and 21 (M48) at around 4.40am this morning, Monday, December 4.

Both carriageways remain closed in both directions. 

Emergency services remain at the scene.

Delays eastbound across the Prince of Wales Bridge are adding at least 60 minutes to journey times.

Road users have been advised to follow the diversion route below if travelling eastbound:

  • Exit the M4 at J22 and take the 2nd exit onto the M49 southbound.
  • Follow the M49 southbound to the M5 J18 and at the roundabout take the 4th exit to rejoin the M5 northbound at J18A.
  • Continue on the M5 northbound to J16 to rejoin the M4 eastbound and continue your journey

Road users have been advised to follow the below diversion if travelling westbound:

  • Exit the M4 at J21 and bear left on to the M48
  • Continue through J1
  • Follow the M48 westbound across the Severn Bridge
  • Continue through J2
  • Continue forward on to the M4 at J23

Further information is available from National Highways by visiting and travel apps, or via its regional twitter feed.