The National highways in India are a network of trunk roads owned by the Ministry of Road Transport and Highways. National highways have flyover access or some controlled-access, where entrance and exit is through the side of the flyover, at each intersection of highways flyovers are provided to bypass the city/town/village traffic and these highways are designed for speed of 100 km/hr. Some national highways have interchanges in between, but do not have total controlled-access throughout the highways. It is constructed and managed by the Central Public Works Department (CPWD), the National Highways and Infrastructure Development Corporation Limited (NHIDCL), and the public works departments (PWD) of state governments. Currently, the longest National Highway in India is National Highway 44 at 4,112 km (2,555 mi). The National Highways Authority of India (NHAI) and the National Highways and Infrastructure Development Corporation Limited (NHIDCL) are the nodal agencies responsible for building, upgrading, and maintaining most of the National Highways network. It operates under the Ministry of Road Transport and Highways. The National Highways Development Project (NHDP) is a major effort to expand and upgrade the network of highways. NHAI often uses a public–private partnership model for highway maintenance, and toll-collection. NHIDCL uses Engineering Procurement and Construction (EPC) model to build, develop and maintain strategic roads in International borders of the country. In India, National Highways are at-grade roads, whereas Expressways are controlled-access highways where entrance and exit is controlled by the use ramps that are incorporated into the design of the expressway. National Highways follows standards set by Indian Roads Congress and Bureau of Indian Standards. { "type": "ExternalData", "service": "geoline", "properties": { "stroke": "#ff0000", "stroke-width": 1 }, "query": "# NHs in India\nSELECT ?id ?idLabel\n(concat('', ?idLabel, '') as ?title)\nWHERE\n{\n?id wdt:P31 wd:Q34442 . # is a highway\n?id wdt:P17 wd:Q668 . # in India\n?id wdt:P16 wd:Q1967342 . # in List of SH in Kerala\nSERVICE wikibase:label { bd:serviceParam wikibase:language 'en'}\n}"} Characteristics India has of National Highways as of March 2021. National Highways constituted 2.7% of India's total road network, but carried about 40% of road traffic, as of 2013. In 2016, the government vowed to double the highway length from 96,000 to 200,000 km. The majority of existing highways are now four-lane roads (two lanes in each direction), though much of this is being expanded to six or more lanes. Some sections of the network are toll roads. Only a few highways are built with concrete.