Roads are one of the strongest measures of economic activity. The denser the road network in a particular area, the easier it is for people in the area to connect with and trade with each other, thus leading to a higher degree of economic activity. The graph here compares the length of roads across Indian states in 2011.
It would also be interesting to see how different states compare in terms of addition to road length between 2009 and 2011. The graph here shows the CAGR (compounded annual growth rate) in total length of roads in each state between 2009 and 2011.