What is the name of the sign on top of the pole?
The sign is a stop sign.
    src       edge_attr  dst
0     1  to the left of   20
1     1  to the left of   19
2     1  to the left of   11
3     1  to the left of    4
4     1  to the left of   18
..  ...             ...  ...
89   21  to the left of    5
90   21  to the left of   11
91   21  to the left of    6
92   21  to the left of   20
93   21  to the left of   19

[94 rows x 3 columns]