The Thorold Tunnel will be closed overnight, once again.
Crews with the Ministry of Transportation will install temporary steel decking in the North tube next week.
The tunnel will be off limits from 8:00 p.m. to 5:00 a.m. on Wednesday, Thursday and Friday.
Detour signs will be posted in the area.
This is a second round of overnight closures for the tunnel.
It was also closed on Monday February 3rd, Tuesday February 4th and Wednesday February 5th.

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