What's missing from the "Signs by the Numbers" page?

A goal is to have each U.S. state and Canadian province.  I have all
50 states.  The Canadian Maritimes, Northwest Territories, and Nunavut
are missing from Canada.  I'll also see if I can get a lot of German
autobahns, because they're a lot of fun.

I am missing all countries other than the U.S., Canada, Denmark,
Sweden, France, Germany, and Austria.

I have managed to find all 99 one- and two-digit numbers, but lots of
three-digit numbers are missing:

134, 139, 172, 174, 186, 187, 201, 227, 230, 236, 256, 258, 260, 268,
269, 273, 284, 288, 317, 323-325, 327-329, 344, 345, 347, 353, 354,
356, 362, 367, 373, 374, 379, 382, 386-389, 392, 393, 397, 398, 406,
409, 413, 424-426, 436-439, 443, 448-455, 457, 458, 461, 463, 464,
467, 469, 474, 477, 479, 482, 483, 493, 497-499, 502, 503, 506, 507,
509, 519, 525, 529, 531, 536, 538, 541, 544-546, 548, 549, 552-554,
556-558, 560-562, 564, 567, 569, 571-573, 576-578, 583, 584, 586, 588,
591-594, 596, 598, 603, 604, 608, 617, 619, 621, 622, 625-629,
632-634, 637-639, 645, 646, 649, 653, 654, 656, 657, 660, 661,
663-665, 668, 669, 671-673, 677, 685, 689, 691-693, 697, 699, 702,
705, 707-709, 714, 716, 718-720, 722, 723, 725-727, 729-736, 738,
740-745, 747-749, 751-755, 761, 762, 764-767, 770-773, 777-779,
781-784, 786, 788, 791, 797-804, 806, 807, 809, 811-819, 821-825,
827-831, 833-835, 837, 838, 842-844, 847, 849, 851-857, 859-861, 863,
866-868, 870-873, 875, 877, 882, 883, 885, 887, 891-893, 897-900, 902,
904-906, 908-911, 913, 914, 917-921, 923, 925-929, 931, 933, 935-939,
941-950, 952, 954, 956-958, 960-964, 966-969, 971, 974-984, 987-989,
991, 993, 996, 998, 999.

I decided not to include 4-digit numbers, even though I've seen plenty
of those, mostly in Virginia and Texas.

One goal is to have each US highway.  Missing US highways:

US 8, US 43, US 48, US 57, US 73, US 91, US 121, US 138, US 151, US
159, US 175, US 195, US 197, US 201, US 258, US 411, US 425, US 730.

There is a US 8, but it's an error shield that used to exist on
Massachusetts 8 near Dalton.  I also have the decommissioned US 99,
the nonexistent US 537 (error shield in New Mexico), and the
nonexistent US 148, US 255, and US 775 (error shields in Virginia)
represented.

Another goal is to have each Interstate highway.  Missing Interstate
highway numbers:

I-73, I-140 (need better), I-164, I-165, I-182, I-184, I-194, I-225,
I-359, I-370, I-384, I-393, I-394, I-464, I-530, I-564, I-575, I-664,
I-691, I-705, I-759.

But I do have Future I-785 and Future I-840 in North Carolina.