Do you see any traffic lights on the pole?
No, there is a flag on the pole.
     src        edge_attr  dst
0      0   to the left of   12
1      0               on    7
2      0   to the left of   24
3      0   to the left of   14
4      0   to the left of    2
..   ...              ...  ...
152   31   to the left of    3
153   31  to the right of   22
154   31  to the right of   12
155   31   to the left of   10
156   31  to the right of   24

[157 rows x 3 columns]