What color does the vehicle that is to the right of the vehicle have?
The van has gray color.
     src        edge_attr  dst
0      1  to the right of    9
1      1  to the right of   18
2      1  to the right of   26
3      2           around   18
4      2  to the right of   20
..   ...              ...  ...
141   36  to the right of   19
142   36  to the right of    7
143   37               on   11
144   37  to the right of   17
145   37  to the right of   35

[146 rows x 3 columns]