What is the vehicle that is on the road next to the train?
The vehicle is a taxi.
    src        edge_attr  dst
0     1          next to   13
1     1             near   14
2     1  to the right of    8
3     1             near   13
4     1          next to   14
5     2  to the right of    4
6     2  to the right of    3
7     2   to the left of    9
8     2   to the left of    7
9     3   to the left of    9
10    3   to the left of    7
11    3  to the right of    4
12    3   to the left of    2
13    4           behind    8
14    4      in front of    6
15    4               on   14
16    4          next to    8
17    4             near    8
18    4      in front of   12
19    4   to the left of    3
20    4   to the left of    2
21    4   to the left of    8
22    4   to the left of    7
23    5   to the left of    8
24    6          wearing    5
25    6           behind    4
26    6   to the left of    8
27    7  to the right of    3
28    7  to the right of    2
29    7  to the right of    4
30    8             near    4
31    8          next to    4
32    8      in front of   12
33    8   to the left of    1
34    8  to the right of    4
35    8  to the right of    5
36    8  to the right of    6
37    8   to the left of   10
38    8  to the right of   12
39    8      in front of    4
40    9  to the right of    3
41    9  to the right of    2
42   10  to the right of    8
43   12   to the left of    8
44   12           behind    8
45   12           behind    4
46   13          next to    1
47   13             near    1
48   14          next to    1
49   14             near    1