*3.4. Betweenness (b)*

The betweenness of node *i* is defined as Equation (7), where *njk* is the number of all the shortest paths connecting the nodes *j* and *k*, and *njk*(*i*) is the number of paths passing through the node *i* among these paths. Similarly, the number of shortest paths through a certain edge can be used to define the betweenness of the edges.

$$b\_{\bar{i}} = \sum\_{j \neq k \neq \bar{i}} \frac{n\_{\bar{j}k}(\bar{i})}{n\_{\bar{j}k}} \tag{7}$$

### **4. Evaluation of Transportation Network Properties**
