What's on the pole?
The traffic signal is on the pole.
    src        edge_attr  dst
0     0   to the left of   14
1     0   to the left of   15
2     1  to the right of   15
3     1  to the right of   13
4     2   to the left of    9
..  ...              ...  ...
81   26  to the right of   10
82   26   to the left of   23
83   27   to the left of    9
84   28   to the left of    4
85   28   to the left of   15

[86 rows x 3 columns]