What vehicles are to the left of the bus?
The vehicles are cars.
    src        edge_attr  dst
0     0  to the right of   17
1     0  to the right of   16
2     0  to the right of    1
3     0  to the right of    5
4     0  to the right of    3
..  ...              ...  ...
62   18   to the left of    7
63   18   to the left of    6
64   18  to the right of   10
65   18   to the left of    4
66   18   to the left of    1

[67 rows x 3 columns]