World Land Transportation Network Length and Density, 2002
The above map represents the density of two major land transportation infrastructures, roads and railways.
Network length tends to be a function of the population and the
level of economic development with geography playing a role in terms
of suitable (flat) landscape. For instance, India has a higher land
network density than China while its level of economic development
is lower. This is in part attributable to a more suitable landscape
in terms of total flat land. Yet, infrastructure quality is not
reflected by this map.