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Because the anti-highway contingent in Swarthmore and Media didn't want a 6-lane interstate going through their precious country communities. It's classic PA, actually. You are absolutely right; this bottleneck is ridiculous. PennDot caved to the vocal minority instead of doing what was right. Actually, I think a PA Supreme Court order mandated that the 4-lane segment was to be built as a compromise after decades of fighting.
I do think it's interesting that most of the bridges in the 2-lane section (especially the bigger bridges at the Route 1 and Media bypass interchanges) seem to be wide enough so all they need is for the 3rd lane on each side to be re-striped. Hopefully PennDot, the Delaware Valley Regional Planning Commission, and Delaware County itself will finally wake up and realize that the only solution to fitting 6 lanes of traffic onto a 4-lane highway is to widen it.
I always find it funny that PA is so anti-highway and anti-change, but then we sit around and lament the loss of young, educated people. Maybe there's a correlation between our crappy infrastructure and our low job growth.
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