Three digits starting with even are loops, with interstates at both ends, starting with odd are spurs, with interstates at one end. Thats why I-495 can be both the capital beltway and loop around boston
If you want a challenge, southwest of Boston there’s a short stretch of overlapping interstates where you can be headed north on I-95 while heading south on I-93
Oh yeah, I always hated that. I used to visit my ex’s parents down in that direction and I knew the way from having driven it every year but if I tried to give directions I never could remember which is 287 and which is 278
Three digits starting with even are loops, with interstates at both ends, starting with odd are spurs, with interstates at one end. Thats why I-495 can be both the capital beltway and loop around boston
If you want a challenge, southwest of Boston there’s a short stretch of overlapping interstates where you can be headed north on I-95 while heading south on I-93
Similar overlaps over in NY with 87/287, and 95 does something shifty near there also.
Edit: and to make things more confusing, there is a 278 in the area also. In fact I can’t remember which one is the 87 overlap lol.
BTW there are multiple I-495s and 2/5 are Spurs
Oh yeah, I always hated that. I used to visit my ex’s parents down in that direction and I knew the way from having driven it every year but if I tried to give directions I never could remember which is 287 and which is 278
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