Police were called to the scene between junctions 33 for Lancaster and 34 for Carnforth at around 1am on Wednesday June 6.
The man is said to have been on the bridge for around 15 minutes before officers managed to talk him down.
A spokesman for the police said: "We put a rolling road block in place in place while we talked to the man.
"He was persuaded to come down safely and passed to the care of paramedics."
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The man was taken to hospital for assessment.