Why Tunnels?

Benefits of tunneling include:

1. 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.

2. 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.

3. Minimal surface impact: Tunnel construction and operation do not create any discernible surface noise or vibration. Tunnel construction and operation are invisible, silent, and undetectable.

4. Weatherproof operation: Rain, snow, wind, and surface temperatures do not affect system operation.

5. Flexible architecture: Architecture can flexibly support different types of transportation (public transportation, moving sidewalks, pedestrian walkways, and freight).

6. Future expansion: For the reasons listed above, it is much simpler to extend a tunnel-based system than a surface-based system.