Are there safety vests or mattresses in the photo?
No, there are no safety vests or mattresses.
    src        edge_attr  dst
0     0   to the left of   18
1     0  to the right of   16
2     0  to the right of   15
3     0  to the right of    9
4     1  to the right of    5
..  ...              ...  ...
86   18  to the right of    7
87   18  to the right of   16
88   19   to the left of   14
89   19   to the left of    1
90   19   to the left of    6

[91 rows x 3 columns]