FWIW..
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...:B :B
Only truckers need to read further.
The company lowboy had no "working" brakes. Small wheels, small brakes. Eastern PA.is all mountains. I would top a hill at about 10 mph to get ready for the downward run with no reliable brakes. I used engine compression in low until it was over revved, then next gear, next gear, etc. Hoping I wouldn't have to shift into the Hail Mary gear, neutral. There were no safety issues, the run was made in the wee hours of the night. The tunnel got built, I got paid for the delivery, so why do we need all the modern BS that I know would accompany this delivery I modern time.???