The map shows the relative density distribution of all weather surfaced major highway roads, in lane kilometers per 100,000 people.
Highway density measure is an indicator of relative ease of logistics, market access to farmers, industry and retail, as well as public and private transport by roads.
Data Source: Table - Distribution of density of national highway lengths, Ministry of Roads Transport and Highways,  Government of India (2013).
The average major highway road density for Japan and United States is from Major Roads - Road system measures for selected countries, FHWA - Department of Transportation, Government of the United States (2010).

The SVG code for disputed national borders in this map is a derivative work of File:India literacy rate map en.svg available on wikimedia commons.
Own work
M Tracy Hunter