Fig. 3
![Fig. 3](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12544-021-00503-4/MediaObjects/12544_2021_503_Fig3_HTML.png)
Close-up of the four vehicle representations, where black corresponds to truck, yellow to bus, white to car, and blue to smaller delivery robot
An Open Access Journal
Close-up of the four vehicle representations, where black corresponds to truck, yellow to bus, white to car, and blue to smaller delivery robot