What's the fence on?
The fence is on the bridge.
    src        edge_attr  dst
0     0               on    8
1     2   to the left of   19
2     2   to the left of   12
3     2   to the left of   10
4     2   to the left of   18
..  ...              ...  ...
62   21  to the right of   12
63   21  to the right of   17
64   21  to the right of   18
65   22   to the left of   14
66   22   to the left of    9

[67 rows x 3 columns]