Which kind of vehicle is it?
The vehicle is a taxi.
    src        edge_attr  dst
0     0   to the left of    9
1     0               of    1
2     0   to the left of   11
3     0  to the right of    3
4     1   to the left of   11
5     2  to the right of    3
6     2  to the right of    7
7     2  to the right of    8
8     2               of    1
9     3   to the left of    2
10    3   to the left of    0
11    4               of    1
12    4  to the right of    6
13    6   to the left of    4
14    7   to the left of    2
15    8   to the left of    2
16    9  to the right of    0
17    9   to the left of   11
18   11  to the right of    1
19   11  to the right of    0
20   11  to the right of    9