National Highway 179A (NH 179A)
Written and checked byRamanathan Virli· Roads & Infrastructure
Salem to Vaniyambadi — 140.0 km
NH 179A is a secondary/branch national highway connecting Salem to Vaniyambadi, spanning 140.0 km through Tamil Nadu. It branches from NH 79.
140.0
Kilometres
1
State
8
Major Cities
NH 79
Parent Highway
NH 179A Route Map
NH79 near Salem, Ayothiapattinam, Pappireddipatti, Harur, Uthangarai, Thirupathur, Jolarpettai, NH48 near Vaniyambadi
States & Union Territories
NH 179A passes through the following 1 state:
Major Cities & Towns Along NH 179A
The highway passes through 8 major cities and towns:
NH 179A Start and End Point
Start Point (Origin)
Salem
End Point (Terminus)
Vaniyambadi
Highway Classification
Speed Limit on NH 179A
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 179A
- ⚠️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 179A start and end?
Which states does National Highway 179A pass through?
What are the major cities on National Highway 179A?
What is the total length of National Highway 179A?
Is National Highway 179A a primary or secondary national highway?
What is the speed limit on National Highway 179A?
What is the route of National Highway 179A? (Route Map)
Planning a Road Trip on NH 179A?
Check out our road safety guides and highway speed limits.
Related National Highways
Other National Highways in Tamil Nadu
See all →Explore More on SignalPe
All National Highways
Browse all 826 national highways in India
National Highways in Tamil Nadu
Every NH passing through Tamil Nadu
Highway Speed Limits
Speed limits on Indian national highways
Overtaking Rules
Safe overtaking practices on highways
GPS Toll System
New GPS-based toll collection system
Road Safety Rules
Complete road safety guidelines for India
Lane Discipline
Lane rules for highways and expressways