Which kind of vehicle is to the right of the car?
The vehicle is a bus.
    src        edge_attr  dst
0     0  to the right of    4
1     0  to the right of    2
2     0  to the right of    6
3     0  to the right of    5
4     2               on    1
5     2  to the right of    3
6     2   to the left of    0
7     3   to the left of    5
8     3   to the left of    2
9     4   to the left of    6
10    4   to the left of    0
11    5  to the right of    3
12    5   to the left of    0
13    6  to the right of    4
14    6   to the left of    0
15    6               on    4