National Highways in Sikkim
10 national highways pass through Sikkim, 1 of them primary routes. Each entry below links to that highway's full route, start and end points, and the states it crosses.
10
Highways
1
Primary NHs
1,002
Total route km
NH 10Primary
Siliguri → Nathu La
NH 310
Gangtok → Nathula
NH 310A
NH310 → Kataola
NH 310B
Lachung → Khangtse
NH 310C
Chungtham → Tso Lhamo
NH 510
Singtham → Yuksom
NH 710
Melli → Ravangla
NH 717A
Bagrakot → Gangtok
NH 717B
Rhenok → Menla
NH 910
Melli → Uttarey
Frequently asked questions
How many national highways pass through Sikkim?
10 national highways run through Sikkim, of which 1 are primary (single- or double-digit) national highways and the rest are branch or spur routes.
Which is the longest national highway in Sikkim?
Among the highways passing through Sikkim, NH 310A is the longest at 144.6 km, running from NH310 to Kataola. Note that this is the highway's full length across all states it passes through, not only the portion inside Sikkim.
What is the speed limit on national highways in Sikkim?
On national highways the default limit notified by the Ministry of Road Transport & Highways is 100 km/h for cars on four-lane and wider divided carriageways, 80 km/h on undivided highways, and 80 km/h for light goods vehicles. State authorities and NHAI can notify lower limits on specific stretches, and the signposted limit always overrides the default.