Three highways

Loyal reader Joan S. answered my question in last week's column about how Unionville got its name, quoting from Edward Pinkowski's 1962 book, "Chester County Place Names":
"Unionville (pop. 400) was first called Jackson's Corner when in 1750 John Jackson built a brick inn at a crossroads four miles north of Kennett Square. As the first storekeeper of the village, Jesse Buffington had much to do with changing the name to Unionville. The fact that three highways united at the village suggested the name. On Dec. 5, 1821, Unionville post office was put on the Chester County list with Charles Buffington as postmaster." 
Joan says, "I can't vouch for the accuracy of this, but it is what Mr. Pinkowski says."
Now I'm left wondering what the three "highways" would be: Route 82, certainly; but did Routes 162 and 842 exist back then? Or maybe Doe Run Road, or Wollaston Road?