The Chennai Bypass is a full-access controlled expressway that interconnects four radial Indian National Highways around Chennai, India covering a distance of 32 km (20 mi) from Perungalathur(near Tambaram) on NH45 to Madhavaram on NH 5 via Maduravoyal at a cost of ₹ 4,050 million. Constructed as part of the National Highway Development Project to decongest the city of transiting vehicles, the expressway interconnects NH45, NH4, NH205 and NH5. This expressway now forms a part of the circular transportation corridor.