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~ Mysterious Entity ~
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Both. The distance is quite wide, and there are a couple islands that would allow part of the crossing to be bridge while part would be tunnel.
 

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People have been recently talking about a new Saint-Laurent crossing linking Repentigny and Varennes to connect Highway 640 and 30... What's the best, a bridge or a tunnel?!
May I ask where you heard this? I haven't heard anything regarding a new link between the South-Shore and Repentigny. tell you the truth, I don't see the usefullness of such a link! A new Champlain bridge is much more important seeing as the one we have can't handle the amount of traffic it has!
 

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~ Mysterious Entity ~
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you mean like L-H Lafontaine bridge/tunnel? Is it cheaper?
Underwater tunnels are always more expensive than bridges, but having a shorter tunnel section augmented by a bridge would certainly be cheaper than a tunnel for the full width.
 
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