What do you think is in front of the ambulance on the right side?
The dirt is in front of the ambulance.
    src        edge_attr  dst
0     0   to the left of    8
1     0  to the right of    7
2     0  to the right of   17
3     0  to the right of   16
4     0  to the right of    1
..  ...              ...  ...
56   20   to the left of    8
57   21   to the left of    3
58   21  to the right of   10
59   22  to the right of   20
60   22  to the right of    5

[61 rows x 3 columns]