LORELAI: You know, um, I happened to be looking through some old maps this afternoon and I couldn’t help but notice that Boston is not that far away.
CHRISTOPHER: Aw, you needed a map to tell you that?
LORELAI: I also noticed that that, um, I-84 is a very good road. Solid, paved.
The Interstate 84, or I-84, is a highway which travels from Dunmore in Pennsylvania to Sturbridge in Massachusetts. The Connecticut section of it passes through Danbury, Waterbury, and Hartford, making it the most obvious choice when driving from Hartford to Boston, and suggesting Stars Hollow is just off this highway.
(Slightly confusingly, there is another I-84 in Oregon. For this reason, the I-84 in Connecticut is often identified as the I-84 East).