What is the vehicle behind the crowd?
The vehicle is a bus.
     src        edge_attr  dst
0      0   to the left of   20
1      0   to the left of    8
2      1   to the left of    6
3      1   to the left of    4
4      1   to the left of   26
..   ...              ...  ...
159   28  to the right of   19
160   28  to the right of    7
161   29  to the right of   16
162   29  to the right of   27
163   29  to the right of   20

[164 rows x 3 columns]