NH 4 linked four of the 10 most populous Indian cities – Mumbai, Pune, Bangalore, and Chennai.

NH 4 was 1,235 km (767 mi) in length and passed through the states of Maharashtra, Karnataka and Tamil Nadu.

National Highway 4 was known as P.B.Road (Pune-Bangalore Road) in many parts of Maharashtra and Karnataka states before it was renumbered.

The NH 4 highway passes through highly populated towns and cities of Maharashtra, Karnataka, Tamil Nadu and Andhra Pradesh namely Pune, Satara, Karad, Sangli, Kolhapur, Belgaum, Dharwad, Hubli, Haveri, Ranibennur, Davanagere, Chitradurga, Tumkur, Bangalore, Kolar, Kanchipuram, and Sriperumbudur.

Shiroli Naka exit is used by vehicles coming from Bangalore, Hubli, Belgaum and Kolhapur to reach Sangli.