Is this a truck or a train?
This is a truck.
    src        edge_attr  dst
0     0   to the left of    4
1     2               on   10
2     4  to the right of   12
3     4   to the left of    7
4     4          driving    2
5     4  to the right of    0
6     4  to the right of    9
7     4          holding   12
8     6  to the right of   11
9     6  to the right of   13
10    7  to the right of    4
11    8   to the left of   14
12    9   to the left of    4
13    9               on    0
14   11   to the left of    6
15   12   to the left of    4
16   13   to the left of    6
17   14               in    3
18   14  to the right of    8