Fig. 5 displays four base networks , 15 x 15 90° network (A0), 15 x 15 45° network (B0), and 15 x 15 30° network (C0), and 4 x 4 complete network (D0), as well as 12 network structures derived from them (three for each). As can be seen, links have been specified as five different hierarchies [1-5]. The boldness and grayness of a link indicates its hierarchy level and a bolder and darker link represents a road of a higher hierarchy. This study examines these 16 networks with proposed structural measures. (p 348 of Xie and Levinson (2007) Measuring the Structure of Road Networks)
The networks used in Figure 5 (Xie and Levinson (2007) Measuring the Structure of Road Networks) are in 16 simple ASCII node and link tables. The 12 derived network structures are obtained by using a simulation model called the degeneration model (Xie and Levinson (2008) The weakest link: The decline of the surface transportation network). The simulator are written in Java and named "SOUND – System for Ultraconnected Network Degeneration" (Xie and Levinson (2016).
Xie, Feng and David Levinson. (2007). Measuring the Structure of Road Networks. Geographical Analysis, 39(3), 336-356.
Simulator used to produce the data:
Xie, Feng; Levinson, David M. (2016). SOUND – System for Ultraconnected Network Degeneration (with code to analyze network geometrics). Retrieved from the Data Repository for the University of Minnesota.
Methodology used in the simulation:
Xie, Feng and David Levinson (2008) The Weakest Link: A Model of the Decline of Surface Transportation Networks. Transportation Research part E 44 100-113. Paper available at: University of Minnesota Digital Conservancy,