Are there both cars and buses in the scene?
Yes, there are both a bus and a car.
     src        edge_attr  dst
0      0   to the left of   23
1      0   to the left of   28
2      0   to the left of    1
3      0   to the left of   17
4      0   to the left of   18
..   ...              ...  ...
128   31  to the right of    5
129   31  to the right of   20
130   31  to the right of   18
131   31  to the right of   23
132   31  to the right of   21

[133 rows x 3 columns]