Is the person to the left of the train using a cellphone?
Yes, the girl is using a cellphone.
    src        edge_attr  dst
0     0   to the left of    2
1     0   to the left of   18
2     0   to the left of    1
3     1  to the right of    0
4     1  to the right of    2
..  ...              ...  ...
87   19  to the right of   12
88   20   to the left of    5
89   20   to the left of   19
90   20   to the left of    4
91   20   to the left of   14

[92 rows x 3 columns]