This is an incomplete list, items italicized I haven't officially clinched (as in driven in the car with the camera, but have at some point(s) in my life driven every mile of)
Clinched:
AZ: SR 101
CA: I-80, I-505
CO: I-76, I-225, I-270, US-138, SH-1, SH-2, SH-127, SH-470 (not including E-470)
ID: I-84, I-86, I-90, I-184, US-12, US-30, SH-16, SH-21, SH-25, SH-41, SH-44, SH-55, SH-58, SH-60, SH-61, SH-66, SH-71, SH-77, SH-99, SH-128
IA: I-29, I-80, I-129, I-235
IL: I-24, I-70, I-190, I-270, I-294, I-355, I-390, IL 38
IN: I-70, I-74, I-80, I-465, I-865
KS: I-670
KY: I-24, I-71, I-75
MA: I-93, MA 3
MI: I-69
MO: I-70, I-270, I-670
MT: US-20, MT-43, MT-278
NC: NC-168
NE: I-76, I-80, I-129, US-138, L-17B, L-17C, L-17E, L-17F, L-17J, L-25A, L-53A, L-53B, L-53C, L-53E, L-79E, L-79H
NY: I-90
OH: I-70, I-71, I-270, I-275, I-670, SR 41, SR 161, SR 315, SR 541
OR: I-82, I-84, I-105, I-205, US-20, US-95, US-730, OR 3, OR 11, OR 82, OR 86, OR 126, OR 242
UT: I-84, SR-16, SR-43, SR-53, SR-83, SR-280
VT: I-93
WA: Officially clinched every single mile of state maintained highway
WI: I-894
WV: I-64
WY: I-80, I-180, US-30,, WYO 10, WYO 12, WYO 13, WYO 14, WYO 34, WYO 71, WYO 74, WYO 76, WYO 78, WYO 89, WYO 92, WYO 151, WYO 152, WYO 153, WYO 154, WYO 156, WYO 157, WYO 158, WYO 159, WYO 160, WYO 161, WYO 210, WYO 212, WYO 213 (former), WYO 214, WYO 215, WYO 216, WYO 217, WYO 218 (former), WYO 219, WYO 221, WYO 222, WYO 223, WYO 224, WYO 225, WYO 230, WYO 236, WYO 237, WYO 238, WYO 239, WYO 241, WYO 270, WYO 271, WYO 272, WYO 310, WYO 311, WYO 312, WYO 313, WYO 314, WYO 315, WYO 316, WYO 317, WYO 318, WYO 320, WYO 321, WYO 352, WYO 353, WYO 354, WYO 370, WYO 371, WYO 374, WYO 377, WYO 410, WYO 411, WYO 413, WYO 414, WYO 530