A traffic incident is causing delays on the M4 London-bound between junctions six and 11.
The average speed of traffic is currently 20mph and travel time is estimated at about one hour.
One eyewitness reported a collision between two vehicles just past junction 7 London-bound, which was on the hard-shoulder.
Police have no further details on the incident at this time.
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The crash, which took place at about 7am today (Thursday), involved three vehicles. One man sadly died as a result of the collision and his next of kin have been informed.