The Viger tunnel was suddenly closed late this afternoon.
It remains off limits in both directions.
Transport Quebec made the decision to close the tunnel after a crack was discovered during an inspection a week ago.
"The city of Montreal was doing roadwork on the Saguinet overpass and they saw too far into a concrete slab" said TQ spokeswoman Sarah Bensadoun.
As a result, TQ determined a portion of the concrete cieling under the new CHUM superhospital was unstable.
Traffic in the area has been a mess.
"We're a bunch of cars just kind of sitting here in the tunnel, moving ever so slightly here and there and it looks like eventually we're all going to get funneled into one lane, but as of right now, nobody can see anything" said CJAD producer and news anchor James Foster, who was stuck in the tunnel.
It's not clear how long the tunnel will be closed.
Photo credit: blog.fagstein.com