The Katraj–Dehu Road Bypass (Marathi: कात्रज-देहु रोड बाह्यवळण महामार्ग) (also known as Westerly Bypass or simply Pune Bypass) is a metropolitan highway serving the city of Pune, India. It passes through Pune as well as Pimpri-Chinchwad. The highway stretches 40 km from Dehu Road in the north to Katraj in the south. It is generally 6 lanes wide (3 in each direction) and certain sections feature separate service lanes. Further, it features around a dozen overpasses/flyovers. It is a part of the National Highway 4 and was widened in early 2000s by the National Highways Authority of India from a 2-lane to a 4-lane highway.
The highway was constructed in 1989. Back then, the idea was to bypass the truck traffic out of the city proper. However now the city has outgrown the bypass leading to a heavy suburban traffic. The Hinjewadi junction on the highway is notorious for traffic jams during rush hours. Thus the authorities widened the highway and built several over-bridges making it almost traffic light-free.
One of the most important software parks of the city – Hinjewadi is situated along this highway. Also the Shri Shiv Chhatrapati Sports Complex, Balewadi, where the 2008 Commonwealth Youth Games were held, is located along this road. All westbound roads of the city intersect the Westerly Bypass. The following exits are listed in north-south direction: