MONTREAL—The Jacques-Cartier Bridge was closed for four hours on the morning of Christmas Day after a large road sign fell onto the five lanes of the important crossing. Traffic was allowed back on the bridge just before 1:45 p.m.

Work crews were on the bridge throughout Tuesday morning as they cut and pulled at the large metal structure that was struck by a truck just after 9:30 a.m.

According to the Surete du Quebec, authorities had to close the bridge to traffic because the fallen road sign—which holds electronic lane signals—covered the entire roadway.

With limited volume on Christmas morning, traffic disruptions were kept to a minimum.

A large container carried by the truck also fell onto the bridge after it struck the sign.