How large are the black wheels?
The wheels are large.
     src       edge_attr  dst
0      0          behind    7
1      1  to the left of   20
2      1  to the left of   11
3      1  to the left of   21
4      3              on    5
..   ...             ...  ...
121   31      walking on   22
122   31         pushing   24
123   31  to the left of   20
124   31  to the left of   14
125   31  to the left of    4

[126 rows x 3 columns]