🛣️Secondary Highway

National Highway 310B (NH 310B)

Lachung to Khangtse — 53.4 km

NH 310B is a secondary/branch national highway connecting Lachung to Khangtse, spanning 53.4 km through Sikkim. It branches from NH 10.

53.4

Kilometres

State

Major Cities

NH 10

Parent Highway

NH 310B Route Map

NH310A near Lachung, Yumthang, Yumesodong, Zero Point, Khangtse.

States & Union Territories

NH 310B passes through the following 1 state:

Sikkim

Major Cities & Towns Along NH 310B

The highway passes through 5 major cities and towns:

●Lachung→●Yumthang→●Yumesodong→●Zero Point→●Khangtse.

View on Google Maps

NH 310B Start and End Point

Start Point (Origin)

Lachung

Junction point from route description

End Point (Terminus)

Khangtse

Junction point from route description

Highway Classification

Highway NumberNH 310B

TypeSecondary/Branch Highway

Parent HighwayNH 10

Total Length53.4 km

Numbering SystemPost-2010 (New)

Managed ByNHAI / MoRTH

Speed Limit on NH 310B

Cars, Jeeps & Light Motor Vehicles100 km/h

Buses & Goods Carriers (medium)80 km/h

Heavy Motor Vehicles (trucks, lorries)60 km/h

Motorcycles & Two-Wheelers80 km/h

Speed limits are prescribed under the Motor Vehicles Act and Central Motor Vehicles Rules for national highways. State governments may impose lower limits on specific stretches.

Safety Tips for Driving on NH 310B

⚠️Always follow the speed limit — 100 km/h for cars and 80 km/h for heavy vehicles on national highways.
⚠️Wear seatbelts and ensure all passengers are buckled up.
⚠️Do not overtake on curves, bridges, or narrow sections.
⚠️Keep a safe following distance, especially during monsoon season.
⚠️Use headlights even during daytime on highways.
⚠️Take breaks every 2 hours during long drives to avoid fatigue.
⚠️In case of an emergency, call 112 (Unified Emergency Number) or 1033 (National Highway Helpline).

Frequently Asked Questions

Which states does National Highway 310B pass through?

National Highway 310B passes through Sikkim.

What are the major cities on National Highway 310B?

The major cities and towns along National Highway 310B include Lachung, Yumthang, Yumesodong, Zero Point, Khangtse..

What is the total length of National Highway 310B?

The total length of National Highway 310B is 53.4 km.

Is National Highway 310B a primary or secondary national highway?

National Highway 310B is a secondary/branch national highway that branches from NH 10.

What is the speed limit on National Highway 310B?

The speed limit on National Highway 310B is 100 km/h for cars and light motor vehicles, 80 km/h for buses and medium goods vehicles, and 60 km/h for heavy motor vehicles (trucks and lorries). These limits are set under the Central Motor Vehicles Rules for national highways. State governments may impose lower limits on specific sections.

What is the route of National Highway 310B? (Route Map)

National Highway 310B follows this route: NH310A near Lachung, Yumthang, Yumesodong, Zero Point, Khangtse..

Planning a Road Trip on NH 310B?

Check out our road safety guides and highway speed limits.

Road Safety Rules Highway Speed Limits Road Trip Checklist