The Rawalpindi-Islamabad Metrobus is a 83.6 km (51.9 mi) bus rapid transit system operating in the Islamabad–Rawalpindi metropolitan area of Pakistan. It consists of four routes, namely the Red, Orange, Blue, and Green Lines. The Red and Orange Lines have dedicated lanes with proper stations built along them, while the Blue and Green Lines currently run along the Islamabad Expressway and Srinagar Highway respectively, with regular traffic.