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I could have sworn when the super charger map from Tesla was zoomable there was a pin just off of 301 around Newburg, MD, but it's not zoomable right now so I can't confirm =(.
Naw, to far north, and wouldn't make 301 really accessible as you'd have to head into the traffic instead of going around it on your way to DE, NY, NJ. Maybe I just misread the map when it was zoomable, but I thought I saw it, and I remember getting excited about it.