Which kind of vehicle is not blue?
The vehicle is a bus.
    src        edge_attr  dst
0     0   to the left of    3
1     1  to the right of   15
2     1   to the left of   12
3     1  to the right of   16
4     1   to the left of    7
..  ...              ...  ...
69   20  to the right of    5
70   20   to the left of   12
71   21   to the left of   12
72   21   to the left of   17
73   21  to the right of    3

[74 rows x 3 columns]