What color is the bus the number is on the front of?
The bus is green.
    src        edge_attr  dst
0     0   to the left of   11
1     0   to the left of    8
2     0  to the right of   13
3     1   to the left of   15
4     2  to the right of   19
..  ...              ...  ...
63   21  to the right of   14
64   22   to the left of    9
65   22   to the left of    4
66   23   to the left of   15
67   23   on the side of    9

[68 rows x 3 columns]