[jedberg]

> Let’s build tunnels under the mountain passes to add more connections into Hollywood so people have better access than winding canyon roads.

This is an interesting idea. I just measured it out, and assuming you could build a straight tunnel to bypass the canyon at the 405, it would be 5.3 miles.

To bypass Laurel Canyon would be a 3.0 mile tunnel.

Coldwater bypass would be 4.1 miles.

So the question is, do we the technology to build tunnels that long and deep (all of those are about 1000 feet). And is it a good idea to build a 1000 foot deep tunnel in an area known for earthquakes?

[wjossey]

I'm not an engineer of that sort, but I'd imagine if we can build subways in earthquake-prone zones like SF, LA, and Tokyo, we can build safe tunnels under mountains in an earthquake zone.