Update: Traffic queuing between Lancaster and Morecambe after partial Bay Gateway closure
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The closure led to severe tailbacks as motorists tried to find alternative routes around the area.
In addition, there were long tailbacks along the Bay Gateway as far as the M6 junction.
The closure was due to a collapsed manhole which needed to be repaired.
A spokesman for Lancashire County Council said: "We closed the Bay Gateway this morning to repair a manhole which had collapsed.
"The issue was first reported to us by the police on Monday night when we made an emergency repair to make the manhole safe; however further work was needed to replace the frame and repair the surrounding road surface to prevent a recurrence.
"The manhole is positioned in the middle of the road, which was why we had to close the whole road at its junction with Morecambe Road.
"We're sorry for the disruption to people's journeys while the closure was in place."
The spokesman said traffic should be returning to normal now after the road was re-opened.