Is there either a green bus or truck?
Yes, there is a green truck.
     src        edge_attr  dst
0      0  to the right of   17
1      0  to the right of   18
2      0  to the right of   24
3      0             near   31
4      0  to the right of   22
..   ...              ...  ...
228   31             near    0
229   31             near    2
230   31             near   21
231   31             near   22
232   31  to the right of    1

[233 rows x 3 columns]