What vehicle is behind the bus?
The vehicle is a car.
    src        edge_attr  dst
0     0   to the left of   10
1     1           behind    8
2     1   to the left of   11
3     1               on    5
4     1   to the left of    8
5     1   to the left of    4
6     2           behind   15
7     2             near    5
8     2           beside    5
9     2           behind    8
10    2             near   11
11    4   to the left of    7
12    4  to the right of    1
13    5             near   11
14    5             near    2
15    6               on    5
16    7  to the right of   10
17    7  to the right of    8
18    7  to the right of    4
19    7               by    5
20    8               on    5
21    8      in front of    1
22    8  to the right of    1
23    8      in front of    2
24    8   to the left of    7
25    8  to the right of   14
26    8  to the right of    9
27    9   to the left of   11
28    9   to the left of    8
29   10  to the right of    0
30   10   to the left of    7
31   11          next to    5
32   11  to the right of    1
33   11  to the right of    9
34   11  to the right of   14
35   11             near    2
36   11             near    5
37   12   to the left of   13
38   13  to the right of   12
39   14   to the left of    8
40   14   to the left of   11
41   15      in front of    2