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South Korea has seven highway systems.

1. National expressways (Korean: 고속국도; Hanja: 高速國道; RR: Gosokgukdo)
2. General national highways (Korean: 일반국도; Hanja: 一般國道; RR: Ilbangukdo)
3. Special Metropolitan City roads and Metropolitan City roads [ko] (Korean: 특별시도·광역시도; Hanja: 特別市道·廣域市道; RR: Teukbyeolsido·Gwangyeoksido)
4. Local highways (Korean: 지방도; Hanja: 地方道; RR: Jibangdo)
5. Si roads (Korean: 시도; Hanja: 市道; RR: Sido)
6. Gun roads (Korean: 군도; Hanja: 郡道; RR: Gundo)
7. Gu roads (Korean: 구도; Hanja: 區道; RR: Gudo)

National Expressways

National Expressways (Korean: 고속국도; Hanja: 高速道路; RR: Gosokgukdo) or Expressways (Korean: 고속도로; Hanja: 高速道路; RR: Gosokdoro)

v t e South Korean expressways
South–North	1 (Gyeongbu) 15 (Seohaean) 17 (Pyeongtaek–Paju) 25 Honam Nonsan–Cheonan 27 (Suncheon–Wanju) 29 (Sejong—Pocheon) 35 Tongyeong–Daejeon Jungbu 37 (2nd Jungbu) 45 (Jungbu Naeryuk) 55 (Jungang) 65 (Donghae)
West–East	10 (Namhae) 12 Muan–Gwangju Gwangju–Daegu 14 (Hamyang–Ulsan) [ko] 16 (Ulsan) 20 (Saemangeum–Pohang) 30 (Seosan–Yeongdeok) 32 (Asan–Cheongju) [ko] 40 (Pyeongtaek–Jecheon) 50 (Yeongdong) 52 (Gwangju–Wonju) 60 (Seoul–Yangyang)
Belt	100 (Capital Region 1st Ring) 300 (Daejeon Southern Ring) 400 (Capital Region 2nd Ring) [ko] 500 (Gwangju Ring) [ko] 600 (Busan Ring) [ko] 700 (Daegu Ring) [ko]
Metropolitan Area	110 (2nd Gyeongin) 120 (Gyeongin) 130 (Incheon Int'l Airport)
Branch	102 (Namhae Branch 1) 104 (Namhae Branch 2) 105 (Namhae Branch 3) 151 (Seocheon–Gongju) [ko] 153 (Pyeongtaek–Siheung) 171 Osan–Hwaseong Yongin–Seoul 204 (Saemangeum–Pohang Branch (Iksan-Wanju)) [ko] 251 (Honam Branch) 253 (Gochang–Damyang) [ko] 301 (Sangju–Yeongcheon) [ko] 451 (Jungbu Naeryuk Branch) 551 (Jungang Branch)
Planned	17 (Iksan–Pyeongtaek) [ko] 173 (Iksan–Pyeongtaek Branch) [ko] 202 (Saemangeum–Pohang Branch (Pohang)) [ko] 255 (Gangjin–Gwangju) [ko] 292 (Sejong–Pocheon Expressway Osong Branch) [ko]
Abolished	Namhae Branch 3 [ko] Guma Branch Gimcheon–Yeongcheon [ko]

General National highways

General National highways (Korean: 일반국도; Hanja: 一般國道; RR: Ilbangukdo) or National highways (Korean: 국도; Hanja: 國道; RR: gukdo)

v t e National highways of South Korea
South-North	1 3 5 7 9† 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41† 43 45 47 51† 53† 59 61† 63† 65† 67 71† 73† 75 77 79 81† 83† 87 91† 93† 95 99
West-East	2 4 6 8† 10† 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50† 52† 54† 56 58 62† 64† 72† 74† 76† 78† 80† 82 88 92† 94†
†: Hypothetical national highways on the territory of North Korea in the case of reunification 　: Abolished national highways

Special Metropolitan City roads and Metropolitan City roads

Special Metropolitan City roads and Metropolitan City roads (Korean: 특별시도·광역시도; Hanja: 特別市道·廣域市道; RR: Teukbyeolsido·Gwangyeoksido)

Special Metropolitan City roads

Special Metropolitan City roads (Korean: 특별시도; Hanja: 特別市道; RR: Teukbyeolsido) are the highway in the special city (Seoul).

Metropolitan City roads

Metropolitan City roads (Korean: 광역시도; Hanja: 廣域市道; RR: Gwangyeoksido) are the highway in the metropolitan city.

• Metropolitan City roads of Busan
• Metropolitan City roads of Daegu
• Metropolitan City roads of Incheon
• Metropolitan City roads of Gwangju
• Metropolitan City roads of Daejeon
• Metropolitan City roads of Ulsan

Local highways

Local highways (Korean: 지방도; Hanja: 地方道; RR: Jibangdo)

State-funded local highways

State-funded local highways (Korean: 국가지원지방도; Hanja: 國家支援地方道; RR: Gukgajiwonjibangdo, shortly Korean: 국지도; Hanja: 國支道; RR: Gukjido)

General local highways

General local highways (Korean: 일반지방도; Hanja: 一般地方道; RR: Ilbanjibangdo

v t e Local highways of South Korea
State-funded (2-digits)	13 15 19 20 22 23 27 28 30 31 32 33 37 39 40 44 49 55 56 57 58 59 60 67 68 69 70 78 79 82 84 86 88 90 95 96 97 98	13 301
Gyeonggi (300s)	301 302 303 305 306 307 308 309 310 311 312 313 314 315 317 318 319 320 321 322 325 326 328 329 330 333 334 335 337 338 341 342 345 347 348 349 352 355 356 357 358 359 360 363 364 367 368 371 372 375 376 379 383 387 390 391 397
Gangwon (400s)	402 403 404 406 407 408 409 410 411 412 413 414 415 416 418 420 421 424 426 427 442 444 446 451 453 456 460 461 462 463 464 494
N. Chungcheong (500s)	501 502 504 505 507 508 509 510 511 512 513 514 515 516 517 519 520 522 525 531 532 533 534 540 571 575 581 583 587 591 592 594 595 596 597 599
S. Chungcheong (600s)	601 602 603 604 606 607 609 610 611 613 614 615 616 617 618 619 622 623 624 625 627 628 629 633 634 635 643 645 647 649 651 691 693 696 697
N. Jeolla (700s)	701 702 703 705 706 707 708 709 710 711 712 713 714 715 716 717 718 720 721 722 723 724 725 726 727 729 730 731 732 733 734 735 736 737 740 741 742 743 744 745 747 749 751 792 795 796 799
S. Jeolla (800s)	801 803 805 806 808 810 811 814 815 816 817 818 819 820 821 822 825 827 829 830 831 835 836 837 838 839 840 842 843 844 845 851 855 857 861 863 865 887 893 895 897 898
N. Gyeongsang (900s)	901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 935 945 997 998
S. Gyeongsang (1000s)	1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1013 1014 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1034 1036 1037 1040 1041 1042 1045 1047 1049 1051 1077 1080 1081 1084 1089 1093 1099
Jeju (1100s)	1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1131 1132 1135 1136 1139
:Abolished route Yearbook of road statistics by Ministry of Land, Infrastructure and Transport, 2017

Si roads

Si roads (Korean: 시도; Hanja: 市道; RR: Sido) are the highways in the cities (Si).

Gun roads

Gun roads (Korean: 군도; Hanja: 郡道; RR: Gundo) are the highways in the counties (Gun).

Gu roads

Gu roads (Korean: 구도; Hanja: 區道; RR: Gudo) are the highways in the districts (Gu).

References

1. Article 10 of the Road Act in South Korea

v t e Highway systems of South Korea
1	Expressway National highway Local highway Special Metropolitan Road		1

• Highway systems of South Korea