What place does this represent?
It represents the pavement.
    src        edge_attr  dst
0     0  to the right of    5
1     0               on   21
2     0   to the left of    2
3     1  to the right of    8
4     1  to the right of   24
..  ...              ...  ...
68   24  to the right of    5
69   25  to the right of   10
70   25   to the left of    8
71   25   to the left of    1
72   25  to the right of   22

[73 rows x 3 columns]