and North–South and East–West Corridor were major ongoing highway development projects in India. State highways State highways are highways connecting major cities throughout a state and are also at-grade roads. They also connect with National Highways or state highways of neighboring states. State Highways are designated with SH, followed by the highway number and preceded by state code. As of 31 March 2020, the total length of state highways was . As of 31 March 2020, Maharashtra has the largest share of state highways among all states (22.14%), followed by Karnataka (11.11%), Gujarat (9.76%), Rajasthan (8.62%) and Tamil Nadu (6.67%). State governments have the authority and responsibility to build state highways. Most of the state highways are developed by state public works departments. Independently of the Bharatmala program, state governments have been implementing a number of state highway projects since 2000. By 2010, state highway projects worth US$1.7 billion had been completed, and projects worth an additional US$11.4 billion were under implementation. District roads District Roads in India are approximately , of which 14.80% of the total length was surfaced. Zila Parishads also have the authority and responsibility to build district roads. Rural roads Rural roads form a substantial portion of the country's road network, forming 72.97% of the total of roads, as of March 2020. As of the same date, the percentage of unsurfaced roads to the total road length was 31%. For the development of these rural roads, Pradhan Mantri Gram Sadak Yojana (Prime Minister's Rural Roads Scheme) was launched in December 2000 by the Indian government to provide connectivity to isolated rural habitations. The scheme envisions that these roads will be constructed and maintained by the village panchayats. In some parts of India, the government has attempted to manage the programme directly as a local social spending program. In other parts of India, the and a sister program named (Build India) have privatized the rural road construction projects and deployed contractors. The effort has aimed to build all-season single-lane asphalted roads to connect India's rural and remote areas. A significant portion of funding for these projects has come from the World Bank and the Asian Development Bank. Border roads Border Roads are the roads constructed along the northern and northeastern borders of our country. These roads are constructed and maintained by Border Roads Organisation (BRO) which was set up in 1960 by the government of India. BRO