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go out of use in the rainy season., , Road Density, , The length of road per 100 sq. km of area, is known as density of roads. Distribution, of road is not uniform in the country. Density, of all roads varies from only 12.14 km in, Jammu and Kashmir to 517.77 km in Kerala, (as on 31 March 2011) with the national, average of 142.68 km (31 March 2011). Road, transportation in India faces a number of, problems. Keeping in view the volume of, traffic and passengers, the road network is, inadequate. About half of the roads are, unmetalled and this limits their usage, during the rainy season. The National, Highways are inadequate too. Moreover, the, roadways are highly congested in cities and, most of the bridges and culverts are old, and narrow. However, in recent years fast, development of road network has taken place, in different parts of the country, , ‘Railways, , Railways are the principal mode of, transportation for freight and passengers in