🛣️Secondary Highway

National Highway 166D (NH 166D)

Pen to Madh (Mahad Ashtvinayak) — 26.4 km

NH 166D is a secondary/branch national highway connecting Pen to Madh (Mahad Ashtvinayak), spanning 26.4 km. It branches from NH 66.

26.4

Kilometres

States

Major Cities

NH 66

Parent Highway

NH 166D Route Map

NH66 near Pen, Ransai, NH548A near Madh (Mahad Ashtvinayak)

Major Cities & Towns Along NH 166D

The highway passes through 3 major cities and towns:

●Pen→●Ransai→●Madh (Mahad Ashtvinayak)

View on Google Maps

NH 166D Start and End Point

Start Point (Origin)

Pen

Junction point from route description

End Point (Terminus)

Madh (Mahad Ashtvinayak)

Junction point from route description

Highway Classification

Highway NumberNH 166D

TypeSecondary/Branch Highway

Parent HighwayNH 66

Total Length26.4 km

Numbering SystemPost-2010 (New)

Managed ByNHAI / MoRTH

Speed Limit on NH 166D

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 166D

⚠️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

What are the major cities on National Highway 166D?

The major cities and towns along National Highway 166D include Pen, Ransai, Madh (Mahad Ashtvinayak).

What is the total length of National Highway 166D?

The total length of National Highway 166D is 26.4 km.

Is National Highway 166D a primary or secondary national highway?

National Highway 166D is a secondary/branch national highway that branches from NH 66.

What is the speed limit on National Highway 166D?

The speed limit on National Highway 166D 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 166D? (Route Map)

National Highway 166D follows this route: NH66 near Pen, Ransai, NH548A near Madh (Mahad Ashtvinayak).

Planning a Road Trip on NH 166D?

Check out our road safety guides and highway speed limits.

Road Safety Rules Highway Speed Limits Road Trip Checklist