A stranded vehicle on the junction 5 slip road is causing delays between Droitwich and Worcester.
The holdup is affecting drivers heading southbound as traffic is starting to back up on to the Sixways roundabout.
Highways England have attributed the blockage to a stranded vehicle and an obstruction on the slip road.
Police have attended the scene and are attempting to clear the obstruction and get traffic resuming as normal.
It is not yet known how long it will take for the blockage to be moved, but commuters are expected to face around 15-minute delays to their journey at present.
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