Are there either white buses or trucks?
No, there is a bus but it is black.
    src        edge_attr  dst
0     0   to the left of   13
1     0   to the left of    7
2     0         crossing    1
3     0   to the left of    3
4     2  to the right of    7
..  ...              ...  ...
88   15  to the right of    3
89   15  to the right of   13
90   15  to the right of   12
91   15   to the left of    4
92   15  to the right of    7

[93 rows x 3 columns]