Officers from the Central Motorway Police Group, covering West Midlands Police and the Staffordshire Police force, are in attendance.
National Highways warned motorists that delays of half an hour were to be expected.
They added that two miles of congestion awaited motorists approaching the junctions.
They tweeted: “Traffic is currently stopped on the #M6 southbound between J8 (#M5) and J7 (#Great Barr) due to a @CMPG led incident.
“There is currently 2 miles of congestion on approach causing delays of 30 mins above normal travel time.”
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