At least one of the tunnel's interior (north of 466 I think, sorry can't recall the exact one) is painted a very light color, beige? Anyway it makes a big difference in the the light level inside the tunnel, especially in the day time. No "black hole" in the middle. At night, headlights really reflect, make visibility much better. Didn't even feel the need for lighting as we drive through.
Painting the interiors could to be a good cost effective solution. Seems like a no-brainer to me.
Don
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Look both ways before crossing.
Western PA, Marietta GA, finally TV....
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