What is the photo showing?
It is showing a road.
    src        edge_attr  dst
0     0  to the right of   12
1     0  to the right of   13
2     1  to the right of   17
3     1  to the right of   12
4     1  to the right of   18
..  ...              ...  ...
73   20   to the left of    2
74   22   to the left of    2
75   22   to the left of    7
76   22   to the left of   11
77   22   to the left of   20

[78 rows x 3 columns]