What is the vehicle to the left of the car called?
The vehicle is a van.
    src        edge_attr  dst
0     0   to the left of   12
1     2  to the right of    3
2     3   to the left of    2
3     4   to the left of   12
4     4   to the left of    5
5     5  to the right of    4
6     5   to the left of    7
7     6   to the left of   10
8     7  to the right of    9
9     7  to the right of    5
10    9   to the left of    7
11   10               on    6
12   10  to the right of    6
13   12  to the right of    4
14   12  to the right of    0