Is the large vehicle to the left or to the right of the cars?
The truck is to the left of the cars.
   src        edge_attr  dst
0    2  to the right of    4
1    2  to the right of    3
2    3  to the right of    4
3    3   to the left of    2
4    4   to the left of    3
5    4   to the left of    2
6    8               on    7