Which kind of vehicle is the driver in?
The driver is in the train.
    src        edge_attr  dst
0     0  to the right of    5
1     0   to the left of    6
2     0   to the left of   11
3     0  to the right of    3
4     0  to the right of    2
5     1  to the right of   11
6     1  to the right of    6
7     2   to the left of    0
8     2  to the right of    3
9     2   to the left of    9
10    3   to the left of    5
11    3   to the left of    0
12    3   to the left of   12
13    3   to the left of    2
14    4  to the right of    6
15    4               on   15
16    4               on   14
17    4             near   12
18    4  to the right of   11
19    5  to the right of    3
20    5   to the left of    0
21    6  to the right of    0
22    6   to the left of   10
23    6   to the left of    1
24    6   to the left of    4
25    8  to the right of   12
26    8  to the right of    9
27    9   to the left of    8
28    9  to the right of    2
29   10  to the right of    6
30   10  to the right of   11
31   11               on   12
32   11               in   12
33   11  to the right of    0
34   11   to the left of    1
35   11   to the left of    4
36   11   to the left of   10
37   12  to the right of    3
38   12   to the left of   14
39   12             near    4
40   12   to the left of   15
41   12   to the left of    8
42   14  to the right of   12
43   15  to the right of   12