Lots of new highways (and counties) on my just-finished trip to New England. Very few clinched highways, however, as the purpose was to grab counties and visit capitals. I'm not adding concurrencies to my list below; just the major routing.
New highways:
CT: I-84, US 1, CT 8, CT 15, CT 27, CT 83, CT 89, CT 190, Milford Parkway
MA: I-495
ME: I-295, US 2, US 202, US 1A, ME 3, ME 6, ME 69, ME 102, ME 104, ME 150, ME 157, ME 197, ME 198, ME 220
NH: I-93, I-293, US 2, US 3, US 4, US 202, US 302, NH 12, NH 123, NH 175
RI: US 6, US 44, RI 3
VT: I-89, I-91, US 2, US 5, US 7, US 302, VT 2A, VT 14, VT 15, VT 103, VT 104, VT 107, VT 116
New mileage:
CT: I-95
MA: I-195, US 3
ME: I-95
RI: US 1, RI 114, RI 138
Clinched:
MA: I-91, MA 83
ME: I-395, ME 168, ME 233
NH: I-393, NH 25B, NH 115, Everett Parkway
RI: I-195, RI 138A
VT: VT 63, VT 104A, VT 123
I probably missed a few on the list here.