What vehicle is behind the bike?
The vehicle is a bus.
     src        edge_attr  dst
0      0  to the right of    1
1      0  to the right of   15
2      0  to the right of   19
3      0   to the left of    8
4      0   to the left of   13
..   ...              ...  ...
115   21  to the right of    6
116   21  to the right of    7
117   21  to the right of   13
118   21  to the right of    8
119   21   to the left of   14

[120 rows x 3 columns]