Transport in Hyderabad is the network of roads, railways, rapid transit system in the capital and the largest city of Telangana. The city of Hyderabad also serves as the central hub of transport and logistics within the state. Road Hyderabad is integrated into the National Highway Network of India through NH 44, NH 65, NH 163, NH 765, NH 765D, while four State Highways SH1, SH4, SH 6, SH 19 originate/terminate in Hyderabad. Hyderabad has a vehicle population of nearly 48 lakhs and is the highest after Delhi, Bengaluru, Chennai and Mumbai. The first Expressway in Hyderabad connecting Mehdipatnam and Aramgarh opened for public in 2009 to ease connectivity to Rajiv Gandhi International Airport located in Shamshabad, and named after the former Prime Minister P V Narsimha Rao. An extension of this Expressway further to Shamshabad was mulled in 2018. The Road Network in Hyderabad is characterised by a concentric network of Inner Ring Road and Outer Ring Road. The latter is an expressway stretching 158 km, built to provide orbital linkage between arterial radial roads within the city, as well as to offer connectivity the National Highways. Bus Telangana State Road Transport Corporation Hyderabad has an extensive intracity, intercity/regional and interstate bus service network operated by TSRTC, backed by the Government of Telangana. Within the municipal limits of the city, TSRTC plies intercity and interstate buses from Mahatma Gandhi Bus Station, Uppal Bus Station, Charminar Bus Station, Dilsukhnagar Bus Station, Koti Bus Station, Rathifile Bus Station, Ghatkesar Bus Station, Afzalgunj Bus Station, Medchal Bus Station, Sanathnagar Bus Station, ECIL Bus Station and Secretariat. City buses are deployed from their respective depots which shall have jurisdiction over the staffing and frequency of services. City and Suburban buses constitute the primary mode of transport in Hyderabad. TSRTC has several kinds of services which differ in comfort, price and the number of stops: Metro Luxury (air-conditioned) City Sheetal (air-conditioned) Metro Deluxe Metro Express Low Floor (non air-conditioned) Metro Express City Ordinary Pushpak (for Airport Connectivity, air-conditioned). electric buses are used in this airport bus service. Setwin The State Government of Telangana (erstwhile Andhra Pradesh) sanctioned minibuses as a self-employment generation scheme which ply between different parts of the city in addition to the city buses run by TSRTC. Taxis Metered Auto Rickshaw usually referred to as an "auto", is another widely available taxi in Hyderabad. Shared 'auto' taxis are also a commonplace