What vehicle is to the right of the ladder?
The vehicle is a bus.
    src        edge_attr  dst
0     0  to the right of   10
1     0  to the right of    6
2     1   to the left of   16
3     1  to the right of   11
4     1  to the right of   21
..  ...              ...  ...
77   21   to the left of    5
78   21   to the left of   14
79   21   to the left of    1
80   21   to the left of   12
81   21   to the left of   15

[82 rows x 3 columns]