There are speed restriction on the M4 in both directions between J30 Cardiff Gate and J49 Pont Abraham.
Anti-ISIS protesters who held a demonstration on the M4 Severn Bridge yesterday have apologised for causing disruption. Protesters from the Kurdish Society in Wales told ITV News that they want more to be done to protect Iraqi Kurds from ISIS.
Gwent Police has confirmed the protest on the M4 this afternoon is now over.
Officers attended the Severn Crossing crossing where a number of protestors - in around ten vehicles - staged an anti-ISIS demonstration on the westbound stretch of the bridge over treatment of Iraqi Kurds.
Protestors demonstrating on the M4 this afternoon say they understand they will have annoyed motorists but felt they 'had to get their message across'.
They say they were protesting about the treatment of Iraqi Kurds by Isis militants.
Protestors are pictured holding flags and waving placards as they demonstrated on the M4 Severn Bridge crossing this afternoon.
There was a heavy police presence as officers from Gwent Police attempted to escort the protestors, believed to be demonstrating over the treatment of Iraqi Kurds by ISIS, off the main carriageway.
Gwent Police say they believe the protest is over treatment of the Iraqi Kurds at the hands of ISIS.
Traffic has begun moving slowly as police attempt to escort the protestors to the M4 tolls and off the main carriageway.
These pictures show protestors hanging out of their cards as they travel along the M4 after holding a demonstration on the westbound Severn Bridge.