What is on the green sign?
The number is on the sign.
    src        edge_attr  dst
0     0   to the left of    8
1     0   to the left of    3
2     0   to the left of   17
3     0   to the left of    6
4     1  to the right of    9
..  ...              ...  ...
77   27   to the left of    7
78   27   to the left of    6
79   28   to the left of    4
80   29   to the left of   12
81   29  to the right of   24

[82 rows x 3 columns]