Forma, Vol. 23 (No. 2), pp. 59-71, 2008
Original Paper

Growth and Shape of Transportation Networks

Tsutomu Suzuki1* and Yasuhiro Watanabe2

1Graduate School of Systems and Information Engineering, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
2Central Nippon Expressway Co., Ltd., Japan
*E-mail address:

(Received May 30, 2008; Accepted October 27, 2008)

Abstract. Normally, network-style infrastructure is built up slowly over time. The shapes that networks form are thought to be related to the performance of networks during this process. Using reduced travel time as an evaluation criterion, this study examines road and rail transportation networks to determine the differences in growth patterns that are caused by various factors, including network speed, urban population distribution, and network shape.

Keywords: Transportation Network, Growth, Speed, Performance

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