National Highway 177B (NH 177B)
Written and checked byRamanathan Virli· Roads & Infrastructure
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
1
State
5
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:
Major Cities & Towns Along NH 177B
The highway passes through 5 major cities and towns:
NH 177B Start and End Point
Start Point (Origin)
Chengam
End Point (Terminus)
Melmaruvathur
Highway Classification
Speed Limit on NH 177B
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
Where does National Highway 177B start and end?
Which states does National Highway 177B pass through?
What are the major cities on National Highway 177B?
What is the total length of National Highway 177B?
Is National Highway 177B a primary or secondary national highway?
What is the speed limit on National Highway 177B?
What is the route of National Highway 177B? (Route Map)
Planning a Road Trip on NH 177B?
Check out our road safety guides and highway speed limits.
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