What kind of vehicle is behind the sign?
The vehicles are buses.
    src        edge_attr  dst
0     0   to the left of   16
1     0   to the left of    7
2     0  to the right of   14
3     0  to the right of    1
4     1   to the left of   16
..  ...              ...  ...
70   17  to the right of   14
71   18  to the right of    2
72   18  to the right of    8
73   18  to the right of   14
74   18  to the right of   13

[75 rows x 3 columns]