[Dr Winston O Boogie jr]

Originally Posted by Shimpy

I would think tunneling under an existing road would be more expensive since the soil under is sand and the need to support the road above. All tunnels I've seen here were built first and then the road built over them. I guess that's what engineers are for.

Ever heard of The Big Dig in Boston? It's called the greatest engineering feat in history. But since it's been done, I don't know why it can't be done on a much smaller scale.

I heard a rumor that there is an existing tunnel under the turnpike that was once used as a cattle crossing.