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