What vehicle is silver?
The vehicle is a bus.
    src        edge_attr  dst
0     0   to the left of    3
1     1  to the right of   16
2     1  to the right of   13
3     1  to the right of    6
4     1  to the right of    4
..  ...              ...  ...
57   16   to the left of    6
58   16   to the left of    8
59   16   to the left of    1
60   17  to the right of   19
61   19   to the left of   17

[62 rows x 3 columns]