Firefighters are at the scene of a multi-vehicle collision on the M4 westbound between junctions 4B and 5.
There are currently delays of 20 minutes, caused by congestion, going past the scene and one lane of the motorway has been closed.
A crew from Slough fire station is attending the incident.
Normal traffic conditions are expected to resume from 6pm onwards.
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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.