The only southbound lane operating on the Mercier Bridge was closed Saturday morning due to a fallen concrete slab.
It is unclear where the piece fell exactly but Transports Quebec said they rushed to the scene to install a steel sheet to contain the rest of the concrete.
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Montreal police were on the scene re-directing traffic back to Montreal until the bridge re-opened its lane at around 11:40 a.m.
The bridge was already operating at half capacity this weekend, with only one lane available in each direction.