The M6 has been shut in both directions near junction 4 and junction 5 and the M42 slip road, police said. Highways England reported the incident at around 7pm. The traffic agency said motorway police and crews from West Midlands Ambulance Service have been deployed to the scene.
Highways England tweeted: “The M6 southbound link to the M42 North and south at J4A (M42Link Birmingham), traffic has been STOPPED due to a police incident.
“Traffic Officers @CMPG @OPUWarks & @OFFICIALWMAS are currently at the scene.”
West Midlands Police has also urged motorists to avoid the area.
In a statement, the force said: “The M6 is currently closed in both directions, near to junction 4 and 5 and the M42 slip road.
“Please avoid the area and thank you for your patience.”
Traffic firm West Midland Roads has said motorists should expect delays of more than 45 minutes on the M6 south approach.
Motorway cameras show long queues forming in the southbound and northbound stretch of the M6.
Shortly before 8pm, the Central Motorway Police Group (CMPG) confirmed the M6 was closed at J4a “due to a vulnerable person on a bridge”.
The police have urged motorists to use an alternative route.
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Shortly after 9pm, police confirmed the vulnerable person is now being cared for by NHS medics and the M6 has re-opened
At 9.06pm, the CMPG tweeted: “M6 J4a is now fully open.
“The vulnerable person is receiving care from @NHSuk.
“Thank you for your patience during the incident.”
For anyone affected, the Samaritans are available 24 hours a day on 116123.