What kind of vehicle is it?
The vehicle is a train.
    src        edge_attr  dst
0     0             near    6
1     0             near    1
2     0             near    8
3     0             near    9
4     0             near   11
..  ...              ...  ...
68   20   to the left of   18
69   21   to the left of   13
70   21  to the right of   20
71   21   to the left of    4
72   21   to the left of    5

[73 rows x 3 columns]