What is the vehicle that the tree is behind of called?
The vehicle is a bus.
    src        edge_attr  dst
0     0             near   13
1     0  to the right of    7
2     0  to the right of   10
3     1  to the right of    8
4     1  to the right of   15
..  ...              ...  ...
64   15  to the right of    5
65   16   to the left of    2
66   16   to the left of   14
67   16  to the right of    4
68   16   to the left of    6

[69 rows x 3 columns]