Tunnels on the PA turnpike at one time had two-way traffic in one tunnel. When I was in trucking in Pa. I delivered the "banana frames" for a new tunnel so each lane had their own tunnel. It was quite a project. Tunnel borer tires were the height of my 18 wheel tractor.
So, the next time you're going through one of the Eastern tunnels and don't see an eighteen wheeler bearing down on you from the opposite direction, think maybe, jerrybo66 had a small part in your safety...
Thank you, Jerry. I will admit, I used to enjoy the old, 2-lane tunnels on the Pike when I was a kid. They sure do seem safer & nicer now.