Nevertheless, the data show that road density might reflect also the area and population of the country23, its physiography and demography (see, for example, the relatively low road density in Canada, Australia, Norway and Finland and the Russian Federation), as well as various other factors related to social and economic development. It is interesting to note that although an increasing trend of road density with the Human Development Index (HDI)26 might be discerned at the national level (Fig ure 3.2), there is not, however, a strong correlation. It sets o minimum ond o maximum for eoch dimension, colled goolposts, ond then ossesses country standing in relotion to these goolposts (expressed os o value between 0 ond 11.