What vehicle is the truck behind of?
The truck is behind the car.
    src        edge_attr  dst
0     0               of   16
1     0  to the right of   15
2     0  to the right of    9
3     1   on the back of   16
4     1  to the right of   14
..  ...              ...  ...
70   16      in front of    5
71   16           behind    8
72   16      in front of    6
73   16        parked on    4
74   16  to the right of    8

[75 rows x 3 columns]