The National Highways Authority of India (NHAI) was constituted in 1988.It is responsible for the development, maintenance and management of National Highways. It was made operational in February 1995 and is currently undertaking the developmental activities under National Highways Development Project (NHDP) in phases. All the phases combined together are aimed at improvement of more than 25,000 km of arterial routes of National Highway Network to international standards. In addition to this, NHAI is also responsible for implementing other projects on National Highways, primarily road connectivity to major ports in India. Besides NHAI, State Public Works Department (PWDs) and Border Road Organisation (BRO) carry out the development of the National Highways.