What is the bus in front of?
The bus is in front of the trees.
    src        edge_attr  dst
0     0   to the left of   11
1     1   to the left of    2
2     2  to the right of    1
3     2   to the left of   12
4     3   to the left of   10
..  ...              ...  ...
64   15   to the left of    4
65   15   to the left of    3
66   16      in front of   14
67   16        parked on   17
68   18   to the left of   11

[69 rows x 3 columns]