Why Tunnels?
Benefits of tunneling include:
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Unlimited capacity: There is no practical limit to how many layers of tunnels can be built, so any current or future capacity outcome can be achieved. This flexibility contrasts with a surface system, where adding a lane to the road is often difficult.
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Minimal land use: Tunnels minimize the use of valuable surface land. Tunnels also do not conflict with currently operating transportation systems, such as roads and sidewalks.
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