🛣️Secondary Highway

National Highway 177A (NH 177A)

Tiruvannamalai to Panruti Cuddalore — 117.0 km

NH 177A is a secondary/branch national highway connecting Tiruvannamalai to Panruti Cuddalore, spanning 117.0 km through Tamil Nadu. It branches from NH 77.

117.0

Kilometres

State

Major Cities

NH 77

Parent Highway

NH 177A Route Map

NH77 near Tiruvannamalai, Thirukoilur, Arasur, Panruti Cuddalore

States & Union Territories

NH 177A passes through the following 1 state:

Tamil Nadu

Major Cities & Towns Along NH 177A

The highway passes through 4 major cities and towns:

●Tiruvannamalai→●Thirukoilur→●Arasur→●Panruti Cuddalore

View on Google Maps

NH 177A Start and End Point

Start Point (Origin)

Tiruvannamalai

Junction point from route description

End Point (Terminus)

Panruti Cuddalore

Junction point from route description

Highway Classification

Highway NumberNH 177A

TypeSecondary/Branch Highway

Parent HighwayNH 77

Total Length117.0 km

Numbering SystemPost-2010 (New)

Managed ByNHAI / MoRTH

Speed Limit on NH 177A

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 177A

⚠️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 177A pass through?

National Highway 177A passes through Tamil Nadu.

What are the major cities on National Highway 177A?

The major cities and towns along National Highway 177A include Tiruvannamalai, Thirukoilur, Arasur, Panruti Cuddalore.

What is the total length of National Highway 177A?

The total length of National Highway 177A is 117.0 km.

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

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

What is the speed limit on National Highway 177A?

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

National Highway 177A follows this route: NH77 near Tiruvannamalai, Thirukoilur, Arasur, Panruti Cuddalore.

Planning a Road Trip on NH 177A?

Check out our road safety guides and highway speed limits.

Road Safety Rules Highway Speed Limits Road Trip Checklist