Source: Adapted from Kansky (1963), p. 23.

Pi Index and the Shape of Transportation Networks

The above figure provides an abstraction between the diameter (d; vertical axis) and length of the network (horizontal axis). A low Pi index is linked with a low level of network development (such as simple corridors) and a high value of Pi is linked with a more extensively developed network (a system of linked cities).

Pi Index

L(G)	D(d)	Pi
130 km	75 km	1.733
245 km	75 km	3.266

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