What is on the post?
The sign is on the post.
    src        edge_attr  dst
0     0   to the left of   17
1     2               on    4
2     2   to the left of   13
3     2  to the right of   15
4     2   to the left of   16
..  ...              ...  ...
80   17  to the right of   10
81   17  to the right of    0
82   17  to the right of   11
83   17  to the right of    5
84   17  to the right of   16

[85 rows x 3 columns]