Highways that just miss state lines

[paytonc]

Originally Posted by Borntoolate85

I-91 in eastern Vermont is the ultimate example. For over 100 miles, the highway never comes closer within three miles of the New Hampshire border, but never crosses into NH.

A sweet deal for New Hampshire, which benefits from the access but never paid a cent to build or maintain the road! I have to wonder why Vermont willingly took the short end of that stick. Sure, NH built most of I-93, but it's much shorter - and they split I-89 in half.

New Hampshire today has 225 miles of Interstate, Vermont 320, despite the former having twice the resident base!

[jbgusa]

Originally Posted by paytonc

A sweet deal for New Hampshire, which benefits from the access but never paid a cent to build or maintain the road! I have to wonder why Vermont willingly took the short end of that stick. Sure, NH built most of I-93, but it's much shorter - and they split I-89 in half.

New Hampshire today has 225 miles of Interstate, Vermont 320, despite the former having twice the resident base!

Picking which side of the Connecticut River, between Vermont and New Hampshire, that I-91 ran up was more or less random, I'm guessing. New Hampshire does not get all that much access. There are not as many bridges over the Connecticut River as you would expect.

[paytonc]

Two I-495s:
- I-495, the Boston outer beltway, is entirely within Massachusetts but comes within 300' of the New Hampshire border in Haverhill MA and within 1.5 miles of the Rhode Island border at Wrentham
- I-495, the Wilmington beltway, splits just south of the Pennsylvania line; indeed, the exit for it is over the line

I suspect that most three-digit Interstates are urban projects led by a single state DOT, and so many will stop short of involving another state.