🛣️Secondary Highway

National Highway 177B (NH 177B)

Chengam to Melmaruvathur — 139.0 km

NH 177B is a secondary/branch national highway connecting Chengam to Melmaruvathur, spanning 139.0 km through Tamil Nadu. It branches from NH 77.

139.0

Kilometres

State

Major Cities

NH 77

Parent Highway

NH 177B Route Map

NH77 near Chengam, Polur, Chetpet, Vandavasi, NH179B near Melmaruvathur

States & Union Territories

NH 177B passes through the following 1 state:

Tamil Nadu

Major Cities & Towns Along NH 177B

The highway passes through 5 major cities and towns:

●Chengam→●Polur→●Chetpet→●Vandavasi→●Melmaruvathur

View on Google Maps

NH 177B Start and End Point

Start Point (Origin)

Chengam

Junction point from route description

End Point (Terminus)

Melmaruvathur

Junction point from route description

Highway Classification

Highway NumberNH 177B

TypeSecondary/Branch Highway

Parent HighwayNH 77

Total Length139.0 km

Numbering SystemPost-2010 (New)

Managed ByNHAI / MoRTH

Speed Limit on NH 177B

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 177B

⚠️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 177B pass through?

National Highway 177B passes through Tamil Nadu.

What are the major cities on National Highway 177B?

The major cities and towns along National Highway 177B include Chengam, Polur, Chetpet, Vandavasi, Melmaruvathur.

What is the total length of National Highway 177B?

The total length of National Highway 177B is 139.0 km.

Is National Highway 177B a primary or secondary national highway?

National Highway 177B is a secondary/branch national highway that branches from NH 77.

What is the speed limit on National Highway 177B?

The speed limit on National Highway 177B 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 177B? (Route Map)

National Highway 177B follows this route: NH77 near Chengam, Polur, Chetpet, Vandavasi, NH179B near Melmaruvathur.

Planning a Road Trip on NH 177B?

Check out our road safety guides and highway speed limits.

Road Safety Rules Highway Speed Limits Road Trip Checklist