What's in front of the wheelchair?
The fence is in front of the wheelchair.
     src        edge_attr  dst
0      1   to the left of   21
1      1   to the left of    7
2      1  to the right of    6
3      1  to the right of   12
4      1  to the right of    9
..   ...              ...  ...
98    21  to the right of    9
99    21  to the right of   14
100   21  to the right of   12
101   22  to the right of   14
102   22  to the right of   15

[103 rows x 3 columns]