Fig. 4
From: Transport indicator analysis and comparison of 151 urban areas, based on open source data
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12544-018-0334-4/MediaObjects/12544_2018_334_Fig4_HTML.png)
Multi variant diagram of small cities. Congestion level (ADETT) over Road IA; Bubble size is proportional to the population density; filled color indicates Train IA, bubble border color indicates Cycle IA, color of starred city- labels indicate BRT IA. For color scaling, see Table.5. The dotted line represents the fitted exponential curve from Eq.(1)