What vehicle is it?
The vehicle is a train.
    src        edge_attr  dst
0     0   to the left of   11
1     0  to the right of   10
2     0   to the left of    6
3     0  to the right of    2
4     1  to the right of    4
5     2   to the left of    0
6     4   to the left of    7
7     4   to the left of   11
8     4   to the left of    1
9     5  to the right of   10
10    6  to the right of    0
11    6  to the right of   11
12    7  to the right of    4
13   10   to the left of    0
14   10   to the left of    5
15   11  to the right of    4
16   11   to the left of    6
17   11  to the right of    0