What is hanging in the pole that looks gray?
The traffic lights are hanging in the pole.
     src        edge_attr  dst
0      0  to the right of    7
1      0   to the left of    4
2      0  to the right of   37
3      0   to the left of   31
4      0  to the right of   18
..   ...              ...  ...
161   37   to the left of    0
162   38   to the left of    7
163   38   to the left of    9
164   38   to the left of   30
165   38   to the left of   37

[166 rows x 3 columns]