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The M2 Medway Bridge was brought to a standstill earlier this afternoon while police responded to reports that a man was on the bridge.
Police received reports of concern for the welfare of the man just after 12.30pm.
The man, from London, was on the bridge, between junctions 2 for Cuxton and 3 for Chatham.
Witnesses said a car was “dangerously close” to the edge of the busy motorway bridge.
Officers closed both sides of the carriageway as a precaution before detaining the man.
The road has now reopened.