What is on the pole?
The traffic signal is on the pole.
    src        edge_attr  dst
0     0   to the left of   18
1     0   to the left of   17
2     0  to the right of   14
3     0   to the left of    2
4     1  to the right of    3
..  ...              ...  ...
88   19  to the right of    3
89   19  to the right of   17
90   19   to the left of    7
91   20   to the left of   17
92   20   to the left of    3

[93 rows x 3 columns]