12/23/2011 04:02 EST | Updated 02/22/2012 05:12 EST

Lafontaine tunnel closed completely Friday night

It could be another challenging night for motorists heading getting on and off the island of Montreal.

The Louis-Hippolyte-La Fontaine tunnel will be closed in both directions starting at 10 p.m., Transport Quebec said Friday.

But the complete closure means work on the South Shore-bound portion of the tunnel, which was shut down Wednesday night, will finish early.

It is expected to open mid-day on Dec. 24.

The northbound lanes headed into Montreal will remain closed until 11 p.m. on Christmas Eve.

Transport Quebec announced a three-day closure of the tunnel in the direction of the South Shore after corrosion was found on beams supporting the paralumes – the light-dimming structures at the entrance and exit of the tunnel.

Crews are now in the process of making the necessary repairs.

Traffic is being rerouted to the Jacques-Cartier and Victoria bridges.