I've put a lot of effort into clinching California roads. Here's my list of state highways (including the California portions of US and Interstate routes):
1, 2, 3, 4, I-5, US-6, 7, 9, I-8, I-10, 11, 14, 15/I-15, 17, 18, 19, 22, 23, 24, 25, 27, 28, 32, 33, 34, 35, 36, 38, 39, I-40, 41, 43, 44, 46, 47, 49, US-50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 65, 66, 67, 68, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, I-80, 83, 84, 86, 89, 90, 91, 92, 94, US-95, US-97, 98, 99, US-101, 103, I-105, 107, 109, 110/I-110, 111, 114, 115, 118, 119, 121, 125, 126, 127, 129, 130, 131, 133, 134, 135, 136, 137, 138, 139, 142, 144, 145, 146, 147, 149, 150, 151, 153, 154, 155, 156, 158, 160, 161, 163, 166, 167, 168, 169, 170, 172, 173, 174, 177, 178, 180, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 195, 197, 198, US-199, 200, 201, 202, 203, 204, I-205, 207, 209, 210/I-210, 211, 213, I-215, 216, 217, 218, 221, 223, 225, 227, 229, 232, 233, 236, 237, 238/I-238, 241, 243, 244, 245, 246, 247, 253, 254, 255, 259, 261, 263, 265, 266, 267, 269, 270, 271, 273, 274, 275, 282, 283, 284, 299, I-305, 330, 371, US-395, I-405, I-505, I-580, I-605, I-710, I-805, 905, I-980 (204 total)
I've also clinched these numbered county routes:
66, A13, A18, D3, E5, E6, E18, G1, G7, G8, G9, G11, G12, G13, G14, G15, G16, G17, G18, G19, G20, J1, J4, J21, J35, J37, J41, J44, J132, N1, N2, N3, N4, N5, N6, N7, N8, N9, R2, R3, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S21, S22, S24, S25, S26, S27, S28, S29, S30, S31, S32, S33, S34, S80 (79 total)
My record for state highway clinches in a single trip is 15, on a trip to Oregon in '17. Since I've been running low on state highways, I've started clinching numbered county routes, and last April I did 24 state or county routes in one trip mostly around the Bay Area:
9, 17, 24, 35, 77, 92, 109, 114, 145, 185, 236, 237, CR-G1, CR-G7, CR-G8, CR-G11, CR-G12, CR-G16, CR-G17, CR-G19, CR-J29, CR-J35, CR-J44
I guess someday I'm going to have to start clinching Forest Routes or something. Or move to a new state.