What color is the vehicle on the street?
The van is gray.
    src        edge_attr  dst
0     0  to the right of   20
1     0  to the right of   11
2     0  to the right of   16
3     0  to the right of    3
4     0  to the right of   13
..  ...              ...  ...
68   20   to the left of   13
69   20   to the left of   15
70   21  to the right of   19
71   21  to the right of   17
72   21  to the right of    1

[73 rows x 3 columns]