What is the white vehicle called?
The vehicle is a trailer.
    src        edge_attr  dst
0     0   to the left of    4
1     0   to the left of   14
2     0   to the left of   12
3     1  to the right of   13
4     1  to the right of    4
5     1  to the right of   14
6     1  to the right of    8
7     2  to the right of    3
8     2  to the right of    4
9     2   to the left of    5
10    2  to the right of   12
11    2  to the right of   14
12    3  to the right of   12
13    3   to the left of    2
14    4   to the left of    8
15    4  to the right of    6
16    4   to the left of    2
17    4   to the left of    1
18    4  to the right of    0
19    5  to the right of    2
20    6   to the left of    4
21    6   to the left of    8
22    6   to the left of   14
23    8  to the right of    6
24    8   to the left of    1
25    8  to the right of    4
26    9  to the right of   13
27   12       sitting on   14
28   12               on   14
29   12  to the right of    0
30   12   to the left of    3
31   12   to the left of    2
32   13   to the left of   15
33   13   to the left of    9
34   13        pulled by   15
35   13   to the left of    1
36   14               on   15
37   14   to the left of    1
38   14  to the right of    0
39   14  to the right of    6
40   14   to the left of    2
41   15  to the right of   13
42   15          pulling   13