Quote:
Originally Posted by trofirhen
I think that's a DYNAMITE idea. But you will run into opponents because of:
1: The Cost. (what you are proposing is mega$$$$$$)
2: The granola-munchers. They'll find a way to call it "unliveable," or such.
3: The general "think small" mentality of Vancouver. It's too dynamic for them
4: The tunnel-phobes. Dunno why, but some people hate / are afraid of , tunnels.
Also, if you could be a bit more specific about what colours represent exactly what, that would be good. (Do they represent elevated roads, or tunnels themselves, for example)
But all in all, if done right -if sufficient funding exists - this is a super idea, IMO. And it is ESPECIALLY relevant in addressing connections to the Upper Levels on the North Shore, which is a 🞵🞵🞵🞵🞵, for geographical reasons.
Thank you for this. 
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Its been a while since I did that, but every line is tunnelled. The terrific feature of modern-day tunnelling using TBMs is once you're deep into solid ground, you no longer need to follow the street grid overhead (like you need to do with cut and cover tunnelling).
Red is the main trunk tunnel - 3 or 4 lanes each direction in two separate tunnels
Green is the ramps for traffic to/from east side of main tunnel.
Blue is the ramps for traffic to/from west side of main tunnel.
I was thinking of the tunnel is an express connection between the North Shore and Vancouver.
ie: entering the tunnel from either direction on Broadway, your only exits are on the north shore. You can't use the tunnel as a quicker way into the west end from Granville. If you want to go from Broadway/Oak to Coal Harbour you will still have to use the same bridges and roads as today.
ie: entering the tunnel from Capilano/Trans Canada Highway gives you an express connection to Downtown Vancouver and the Broadway corridor. It won't give you a shortcut to Park Royal Mall.
I think I did some other variants with the southern end of the tunnel under Arbutus St, or Cambie St, or Oak St, or Main St.
I pretty sure I drew one connecting Main St in Vancouver with Lonsdale Ave in North Van but that was under the widest and deepest part of the harbour, so it didn't make sense.
as for cost? Obviously several billion.
However that should be compared to the costs of rebuilding all the bridges between downtown and the rest of the area with a no increase in traffic lanes. Adding 6 or 8 new lanes between Vancouver and the North Shore will likely reduce traffic on the bridges (why take the ziggy-zaggy streets and bridges when the tunnel will get you there direct) which would mean the bridges can be used longer before their next major overhaul or replacement.
The next rebuild of the Lions Gate Bridge can turn it into a SkyTrain bridge so the Canada Line or the Expo Line can get sent to the North Shore.