[KennyBlanken]

That's nice but doesn't explain why the traffic system for the tunnel's one lane of car traffic is so rudimentary and restrictive.

[sufficer]

Because there is essentially no traffic

[VintageCool]

because the tunnel was built for trains, not cars. The tunnel was built by and for the military back when the base was important; there isn't enough reason to spend the money to expand the tunnel now.