What is the number on?
The number is on the sign.
    src        edge_attr  dst
0     2  to the right of    3
1     2  to the right of    5
2     2             near   16
3     2  to the right of    7
4     2   to the left of    8
..  ...              ...  ...
66   16             near    3
67   18  to the right of   10
68   18  to the right of    8
69   19   to the left of    8
70   19  to the right of    4

[71 rows x 3 columns]