What is the bus in front of?
The bus is in front of the hydrant.
    src        edge_attr  dst
0     1           behind    9
1     1  to the right of    9
2     3  to the right of    9
3     3  to the right of   19
4     3  to the right of   22
..  ...              ...  ...
76   22   to the left of   19
77   22  to the right of   18
78   22  to the right of    7
79   22   to the left of   21
80   22   to the left of   20

[81 rows x 3 columns]