In olden times, the road from Pune to Satara went over the top of the hill. A tunnel (the old tunnel) was constructed when two-lane national highway, NH4, was constructed in 1960s. A new tunnel was bored through the hill for widening the highway to four lanes in 2007.
The old tunnel is located on Katraj ghat. It is used by MSRTC buses and other vehicles from Swargate to south Maharashtra and few travelling in Konkan area and on the return route. Though there is no engraved board on the tunnel, there are records. The tunnel was constructed during year 1900 by a contractor named Vittul Sayanna. Until that time, rail & road route to Satara was via Saswad-Neera-Lonand. Sayanna also built the MES Boys' High school (also called Perugate High school)in 1904.
The New Katraj Tunnel is located on the NH 4, Pune, India. It is a three-lane tunnel. The tunnel is 1,338 metre long. This tunnel replaced the Old Katraj Tunnel. The road includes construction of an entirely new tunnel to bypass the older routes and one of the tallest viaduct in India (510 meters). The construction was undertaken by ShaktiKumar Sancheti.