What is the vehicle in front of the bare tree?
The vehicle is a bus.
    src        edge_attr  dst
0     0   to the left of    9
1     0   to the left of    1
2     0           behind    1
3     1      in front of   13
4     1      in front of    0
..  ...              ...  ...
57   16  to the right of    1
58   16   to the left of   11
59   16            below   14
60   17   to the left of   13
61   17   to the left of    5

[62 rows x 3 columns]