Are the passengers in the bottom or in the top part of the picture?
The passengers are in the bottom of the image.
   src        edge_attr  dst
0    0  to the right of    4
1    2               on    1
2    2               in    1
3    2  to the right of    4
4    4   to the left of    2
5    4   to the left of    0
6    6               on    2