Also about that time (Summer of 1974), I-81 did not yet connect to I-84 in Scranton so you took PA 209 through the Poconos between them to get to/from New England. "209" was a gorgeous road of sweeping curves and moderate elevation changes, just like Sawmill Parkway. Speed limit back then was 60mph and there were a LOT of Semis on it, all haulin' arse trying to get onto the next interstate.
That area was also PACKED with resorts (Kinda like the one in "Dirty Dancing") and a lot of the time you would be sailing through there at 60+, only to have some old white-haired goat in his Buick Electra Convertible pull out in front of you, new or weekend girlfriend practically sitting on his lap and the car doing 35-40mph.
Did I mention that "209" was/is a 2-lane road? There were almost no passing areas so you had to just sit back there fuming and watching the line of cars get longer in your mirrors.
Speaking of mirrors, those two lanes weren't especially wide, either, so when you approached an oncoming semi (at a combined speed of 120mph) the two truck's mirrors were maybe a foot apart or less when you passed. THAT took a bit of getting used to, but I never clipped another truck's mirrors in three years of taking that route (although I did close my eyes a couple times).
@Al Gallo and Heidi took the 209 in their speedster going to Carlisle one year and it was the hit of their trip - So much so that they took it again going home and stopped at a resort overnight in both directions. Of course, the fact that they drove through a downpour on the way down to get there wasn't all that pleasant, but hey! That's Carlisle week weather! It'll dry out!